1 Chronicles 7:3

Nathan said. Nathan was a prophet, but at the moment was evidently expressing his own private opinion. A prophet can give to men an inspired message only if God has given to him such a message. It is the prophet’s privilege when confronted with a difficult question to pray for an inspired answer, but the disposition of the answer is of the Lord. There are times when the Lord sees it is better for men to make their own decisions and thus develop the faculty of wise judgment. At other times He is pleased to send a divine message. Such divine communications are frequently qualified by the distinguishing statement, “Thus saith the Lord” (see v. 5).

Go, do all. The purpose expressed by David appeared good and Nathan naturally thought that it was right for the king to carry it into execution. The prophet, however, had not received any confirmatory message. He spoke according to his own sense of right, and not in response to divine revelation.