God's motivation to saving His elect is Love for them only

"And the truth is, that God took up as vast a love unto us of himself at first as ever he hath borne us since, and all that Christ doth for us is but the expression of that love which was taken up originally in God's own heart. Thus we find that out of that love he gave Christ for us. So John 3:16, 'God so loved the world (of elect), that he gave his only begotten Son to die', etc. Yea, Christ's death was but a means to commend or set fortg that love of his unto us." -Thomas Goodwin, Christ Set Forth, Pg. 227