"He surrounded him": viz. (Ibid. 12:1) "And the L-rd said to Avram: Go for your sake, etc."
"He built Him": Before Abraham came to the world, it seemed (as it were) as if the Holy One Blessed be He were king of the heavens alone, viz. (Ibid. 24:7) "O L-rd, G-d of the heavens, who took me, etc." But when Abraham came to the world, he enthroned Him over heaven and earth, viz. (Ibid. 3) "And I will have you swear by the L-rd, G-d of heaven and G-d of earth."
"He guarded Him like the apple of his eye": Even if the L-rd asked Abraham for his eyeball, he would give it to Him. And not his eyeball alone, but he would give Him even his most beloved, his soul, viz. (Ibid. 22:2) "Take, now, your son, your special one, whom you love, Isaac." Is it not known that Isaac is his "special one"? (Why, then, need it be stated?) It must be that his special one, in this instance, refers to his soul, which is thus called elsewhere, viz. (Psalms 22:21) "Save my soul from the sword; from the dog, 'yechidathi'" (my special one).