'Useless' in the Bible

nor to occupy themselves with myths and interminable genealogies. Such things promote useless speculations rather than God's redemptive plan that operates by faith.

Train yourself in godliness. Exercise for the body is not useless, but godliness is useful in every respect, possessing, as it does, the promise of Life now and of the Life which is soon coming.

But those who [are not financially ethical and] crave to get rich [with a compulsive, greedy longing for wealth] fall into temptation and a trap and into many foolish and harmful desires that plunge people into ruin and destruction [leading to personal misery].