The Father contemplated all on behalf of whom he delivered up the Son in the distinctiveness of the sin, misery, liability, and need of each. If we had been submerged in the mass, if we had not been contemplated in the particularity that belongs to us, there would be no salvation. The Father had respect to all of us when he delivered up the Son.
The giving of the Son on behalf of God's people is the fullest, most inarguable demonstration of His being for us that could possibly be given. And in light of the giving of His Son in our place, does it not follow that He will not along with Him freely give us all things? His point is obvious: God is for us and will not withhold from us anything necessary to life and godliness. He has given us Christ, in whom are hidden all the treasures of wisdom and knowledge, who has become to us our all-in-all. Murry commented,
If the Father did not spare his own Son but delivered him up to the agony and shame of Calvary, how could he possibly fail to bring to fruition the end contemplated in such sacrifice. The greatest gift of the Father, the most precious donation given to us, was not things. It was not calling, nor justification, nor even glorification. It is not even the security with which the apostle concludes his peroration (vs. 39). These are favours dispensed in the fulfillment of God’s gracious design. But the unspeakable and incomparable gift is the giving up of his own Son. So great is that gift, so marvellous are its implications, so far-reaching its consequences that all graces of lesser proportion are certain of free bestowment.…Since he is the supreme expression and embodiment of free gift and since his being given over by the Father is the supreme demonstration of the Father’s love, every other.
James R. White, The God Who Justifies, p. 247-248