1 Chronicles 29:14

But who am I
Originally dust and ashes, a sinful creature, unworthy to receive anything from God, and of having the honour of doing anything for him:

and what is my people:
subject to him, the least of all people, separated from the nations round about them, and despised by them:

that we should be able to offer so willingly after this sort?
that they, who were a poor people, some years ago brought out of Egyptian bondage, should now be possessed of such an affluence, and have such a generous heart and liberal spirit given them, as to contribute in so large and liberal a manner as they had done; all was owing to the goodness of God to them, and the efficacy of his grace upon them:

for all things come of thee;
all good things, temporal and spiritual; the Lord is the fountain of goodness, and Father of mercies:

and of thine own have we given thee;
for there is nothing a man has but he has received from the Lord, and therefore can give nothing to him but his own, see ( Romans 11:35 Romans 11:36 ) .