Satan had pointed to Adam's sin as proof that God's law was unjust, and could not be obeyed.  In our humanity, Christ was to redeem Adam's failure.  But when Adam was assailed by the tempter, none of the effects of sin were upon him.  He stood in the strength of perfect manhood, possessing the full vigor of mind and body.  He was surrounded with the glories of Eden, and was in daily communion with heavenly beings.  It was not thus with Jesus when He entered the wilderness to cope with Satan.  For four thousand years the race had been decreasing in physical strength, in mental power, and in moral worth; and Christ took upon Him the infirmities of degenerate humanity.  Only thus could He rescue man from the lowest depths of his degradation.  {DA 117.1} 

Many claim that it was impossible for Christ to be overcome by temptation.  Then He could not have been placed in Adam's position; He could not have gained the victory that Adam failed to gain.  If we have in any sense a more trying conflict than had Christ, then He would not be able to succor us.  But our Saviour took humanity, with all its liabilities.  He took the nature of man, with the possibility of yielding to temptation.  We have nothing to bear which He has not endured.  {DA 117.2}