Charles H. Spurgeon on Psalms 31:5

Into thine hand I commit my spirit, etc. For what are the saints to commit their spirits into the hands of God by Jesus Christ? 1. That they may be safe; i.e., preserved in their passage to heaven, from all the enemies and dangers that may stand in the way. When saints die, the powers of darkness would, doubtless, if possible, hinder the ascending of their souls to God. As they are cast out of heaven, they are filled with rage to see any out of our world going thither. One thing, therefore, which the saint means in committing his spirit into the hands of God, is, that the precious depositum may be kept from all that wish or would attempt its ruin. And they are sure that almighty power belongs to God: and if this is engaged for their preservation, none can pluck them out of his hand. The Redeemer hath spoiled principalities and powers, and proved it by his triumphant ascension to glory; and hath all his and the believer's enemies in a chain, so that they shall be more than conquerors in and through him. Angels, for order's sake, are sent forth to minister to them and be their guard, who will faithfully attend them their charge, till they are brought to the presence of the common Lord of both. "I know, "saith the apostle, "whom I have believed; and I am persuaded that he is able to keep that which I have committed unto him against that day."

2. They commit their soul into the hands of God, that they may be admitted to dwell with him, even in that presence of his where there is fulness of joy, and where there are pleasures for evermore: where all evil is excluded, and all good present, to fill their desires, and find them matter of praise to all eternity.

3. They commit their departing spirits into the hands of God, that their bodies may be at length raised and reunited to them, and that so they may enter at last into the blessedness prepared for them that love him...The grounds on which they may do this with comfort, i.e., with lively hopes of being happy for ever, are many. To mention only two:

(a) God's interest in them, and upon the most endearing foundation, that of redemption. Into thine hand I commit my spirit; for thou hast redeemed me. Redeemed me from hell and the wrath to come, by giving thy Son to die for me. Lord, I am not only thy creature, but thy redeemed creature, bought with a price, saith the saint. Redeemed me from the power of my inward corruption, and from love to it, and delight in it; and with my consent hast drawn me to be thine, and thine for ever. Lord, I am thine, save me unchangeably.

(b) His known faithfulness. Into thine hand I commit my spirit, O Lord God of truth. Into thine hand I commit my spirit, who hast been a God of truth, in performing thy promises to all thy people that are gone before me out of this world; and has been so to me hitherto, and, I cannot doubt, wilt continue so to the end. Daniel Wilcox.