1 Kings 3:14

Go out or come in] i.e. pursue the active life of a man in his prime: cp. Numbers 27:17; 1 Samuel 18:13; Deuteronomy 31:2.

9. Solomon's prayer exhibits (a) a strong sense of responsibility and a conviction that high position involves corresponding duties; (b) a consciousness that truth and falsehood, right and wrong, are not always easy to distinguish, and that to discern between them there are needed special gifts of the heart and understanding; (c) that such gifts are derived from God, who bestows them in answer to prayer.

I will lengthen thy days] The promise was made on conditions which Solomon did not observe: see 1 Kings 11:18.