'Walk' in the Bible

I saw all the living that walk under the sun, that they were with the youth, the second, that stood up in his stead.

For what advantage hath the wise more than the fool? or what hath the poor man, that knoweth how to walk before the living?

Rejoice, O young man, in thy youth, and let thy heart cheer thee in the days of thy youth, and walk in the ways of thy heart, and in the sight of thine eyes; but know thou, that for all these things God will bring thee into judgment.