And forget not any of his benefits Here, he instructs us that God is not deficient on his part in furnishing us with abundant matter for praising him. It is our own ingratitude which hinders us from engaging in this exercise. In the first place, he teaches us that the reason why God deals with such liberality towards us is, that we may be led to celebrate his praise; but at the same time he condemns our inconstancy, which hurries us away to any other object rather than to God. How is it that we are so listless and drowsy in the performance of this the chief exercise of true religion, if it is not because our shameful and wicked forgetfulness buries in our hearts the innumerable benefits of God, which are openly manifest to heaven and earth? Did we only retain the remembrance of them, the prophet assures us that we would be sufficiently inclined to perform our duty, since the sole prohibition which he lays upon us is, not to forget them.

Bless the Lord, O my soul - The repetition here denotes the intensity or earnestness of the wish or desire of the psalmist. It is an emphatic calling upon his soul, that is, himself, never to forget the many favors which God was continually conferring upon him.
And forget not all his benefits - Any of his favors. This refers not to those favors in the aggregate, but it is a call to remember them in particular. The word rendered "benefits" - גמול gemûl - means properly an act, work, doing, whether good or evil, Psalm 137:8; and then, "desert," or what a man deserves "for" his act; "recompence." It is rendered "deserving" in Judges 9:16; benefit, as here, in 2-Chronicles 32:25; "desert," Psalm 28:4; "reward," Psalm 94:2; Isaiah 3:11; Obadiah 1:15; "recompence," Proverbs 12:14; Isaiah 35:4; Isaiah 59:18; Isaiah 66:6; Jeremiah 51:6; Lamentations 3:64; Joel 3:4, Joel 3:7. The proper reference here is to the divine "dealings," - to what God had done - as a reason for blessing his name. His "dealings" with the psalmist had been such as to call for praise and gratitude. What those "dealings" particularly were he specifies in the following verses. The call here on his soul is not to forget these divine dealings, as laying the foundation for praise. We shall find, when we reach the end of life, that all which God has done, however dark and mysterious it may have appeared at the time, was so connected with our good as to make it a proper subject of praise and thanksgiving.

Forget not all his benefits - Call them into recollection; particularize the chief of them; and here record them for an everlasting memorial.

Bless the Lord, O my soul,.... Which is repeated to show the importance of the service, and the vehement desire of the psalmist, that his soul should be engaged in it:
and forget not all his benefits; not any of them; the least of them are not to be forgotten, being such as men are altogether unworthy of; they flow not from the merit of men, but from the mercy of God; and they are many, even innumerable; they are new every morning, and continue all the day; and how great must the sum of them be, and not one should be forgotten; and yet even good men are very apt to forget them; as the Israelites of old, who sung the praises of the Lord, and soon forgot his works: the Lord, knowing the weakness of his people's memories, has not only, under the Gospel dispensation, appointed an ordinance, to be continued to the end of the world, to commemorate a principal blessing and benefit of his, redemption by his Son; but has also promised his Spirit, to bring all things to their remembrance; and this they should be concerned for, that they do remember what God has done for them, in order both to show gratitude and thankfulness to him, and for the encouragement of their faith and hope in him.

forget not all--not any, none of His benefits.