Nb wrote:

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Why does God include us when He could have done it all Himself?

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In the Bible, one answer to this question is that heavenly intelligences are interested in the great controversy and plan of salvation, and this point is illustrated in the dialogue between the Lord and Satan (Job 1:6-12), and in the statement about how angels desire to look into certain issues (1 Peter 1:12).

Given this interest, our response to the plan of salvation serves as a witness for good or bad.  In the case of Job, this is illustrated in familiar passages like Job 19:25-27.  Our response also serves to develop our characters.

The SOP expands on this theme in many passages, for example the two below.  The second passage says that our world is the "lesson book of the universe".

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The holy inhabitants of other worlds were watching with the deepest interest the events taking place on the earth. In the condition of the world that existed before the Flood they saw illustrated the results of the administration which Lucifer had
endeavored to establish in heaven, in rejecting the authority of Christ and casting aside the law of God. In those high-handed sinners of the antediluvian world they saw the subjects over whom Satan held sway. The thoughts of men's hearts were only evil continually. Genesis 6:5. Every emotion, every impulse and imagination, was at war with the divine principles of purity and peace and love. It was an example of the awful depravity resulting from Satan's policy to remove from God's creatures the restraint of His holy law.  {PP 78.4}

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By coming to dwell with us, Jesus was to reveal God both to men and to angels. He was the Word of God,--God's thought made audible. In His prayer for His disciples He says, "I have declared unto them Thy name,"--"merciful and gracious, long-suffering, and abundant in goodness and truth,"--"that the love wherewith Thou hast loved Me may be in them, and I in them." But not alone for His earthborn children was this revelation given. Our little world is the lesson book of the universe. God's wonderful purpose of grace, the mystery of redeeming love, is the theme into which "angels desire to look," and it will be their study throughout endless ages. Both the redeemed and the unfallen beings will find in the cross of Christ their science and their song. It will be seen that the glory shining in the face of Jesus is the glory of self-sacrificing love. In the light from Calvary it will be seen that the law of self-renouncing love is the law of life for earth and heaven; that the love which "seeketh not her own" has its source in the heart of God; and that in the meek and lowly One is manifested the character of Him who dwelleth in the light which no man can approach unto.  {DA 19.2}

nb wrote:

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so you are saying here that it is to 

1)build our characters

2)for other worlds and angels to see that we are worthy

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These things are part of it.

They feed into a deeper purpose, which is to testify about the attributes of God.

For example, the Bible says that Job ultimately spoke of the Lord "the thing that is right" (Job 42:7).

There is a variety of Bible and SOP material that talks about how we vindicate the divine government, and a powerful and profound example is below.

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For what was the great controversy permitted to continue throughout the ages? Why was it that Satan's existence was not cut short at the outset of his rebellion? It was that the universe might be convinced of God's justice in His dealing with evil; that sin might receive eternal condemnation. In the plan of redemption there are heights and depths that eternity itself can never exhaust, marvels into which the angels desire to look. The redeemed only, of all created beings, have in their own experience known the actual conflict with sin; they have wrought with Christ, and, as even the angels could not do, have entered into the fellowship of His sufferings; will they have no testimony as to the science of redemption --nothing that will be of worth to unfallen beings?  {Ed 308.3}

Nb wrote:

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So Ill not be able to understand fully until heaven the whole of it all.

Is that right?

how about this ?

 

He that gives to the needy blesses others, and is blessed himself in a still greater degree. God could have reached His object in saving sinners without the aid of man; but He knew that man could not be happy without acting a part in the great work in which he would be cultivating self-denial and benevolence. T.vol. 3, p. 382.

 

 

In doing for others, a sweet satisfaction will be experienced, an inward peace which will be a sufficient reward. When actuated by a high and noble desire to do others good, they will find true happiness in a faithful discharge of lifes manifold duties. This will bring more than an earthly reward; for every faithful, unselfish performance of duty is noticed by the angels, and shines in the life record. In Heaven none will think of self, nor seek their own pleasure; but all, from pure, genuine love, will seek the happiness of the heavenly beings around them. If we wish to enjoy heavenly society in the earth made new, we must be governed by heavenly principles here.T. vol. 2, pp. 132, 133.

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Hi Nb, your original question has multiple answers, and I focused on the great controversy theme because I thought it the most central.

As an example of a different theme, the Bible and SOP say a great deal about divine-human cooperation, and the role we play in the process of salvation, and how our spiritual activities in this area feed into the process whereby divine agencies change our characters over time.

Bible examples of this theme include Philippians 2:12-13 and Colossians 1:29.

An example of an SOP quote is the one below, that talks about the cooperation of the divine and human in forming our symmetrical characters.

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He who would build up a strong, symmetrical character, he who would be a well-balanced Christian, must give all and do all for Christ; for the Redeemer will not accept divided service. Daily he must learn the meaning of  self-surrender. He must study the word of God, learning its meaning and obeying its precepts. Thus he may reach the standard of Christian excellence. Day by day God works with him, perfecting the character that is to stand in the time of final test. And day by day the believer is working out before men and angels a sublime experiment, showing what the gospel can do for fallen human beings.  {AA 483.1}

I understand Refulgent. Many aspects. 

here is another 

God might have committed the message of the gospel, and all the work of loving ministry, to the heavenly angels. He might have employed other means for accomplishing His purpose. But in His infinite love He chose to make us co-workers with Himself, with Christ and the angels, that we might share the blessing, the joy, the spiritual uplifting, which results from this unselfish ministry.Steps to Christ, pp. 83, 84.

Heres another.....

Those who deny self to do others good, and who devote themselves and all they have to Christs service, will realize the happiness which the selfish man seeks for in vain.Testimonies, vol. 3, p. 397.