Charles Ellicott Commentary 1 Chronicles 17:2

"And Nathan said unto David, Do all that is in thy heart; for God is with thee." — 1 Chronicles 17:2 (ASV)

Do.—Samuel: Go, do.

All that is in your heart.—According to Hebrew ideas, the heart was the seat of the mind and will, as well as of the emotions. But even the great Greek Aristotle, seven centuries later than David, supposed the brain to be merely a kind of cooling counterpoise to the heat of the liver.

God.—In Samuel, the term is “Jehovah”; but in the last verse, the phrase is “ark of God.”