Since it is people that make up His Church and these He is testing and proving, so in essence He is proving His Church!  Another Gem from our Elder Sister,

The Lord is testing and proving His people. You may be just as severe and critical with your own defective character as you please; but be kind, pitiful, and courteous toward others. Inquire every day: Am I sound to the core, or am I false-hearted? Entreat the Lord to save you from all deception on this point. Eternal interests are involved. While so many are panting after honor and greedy of gain, do you, my beloved brethren, be eagerly seeking the assurance of the love of God and crying: Who will show me how to make my calling and election sure? {CCh 179.2}
 
Satan carefully studies the constitutional sins of men, and then he begins his work of alluring and ensnaring them. We are in the thickest of temptations, but there is victory for us if we fight manfully the battles of the Lord. All are in danger. But if you walk humbly and prayerfully you will come forth from the proving process more precious than fine gold, even than the golden wedge of Ophir. If careless and prayerless, you will be as sounding brass and a tinkling cymbal. 259 {CCh 179.3}

Isa 13:12 I will make a man more precious than fine gold; even a man than the golden wedge of Ophir.  ( Note!  This whole chapter of Isa 13: is a pertinent read! )

For sure dear folks we want to see ourselves as He sees us, for yes He knows us better than we know ourselves!

1Jo 4:4 ¶ Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.
1Jo 4:5 They are of the world: therefore speak they of the world, and the world heareth them.
1Jo 4:6 We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.