'Useless' in the Bible

nor to pay attention to legends (fables, myths) and endless genealogies, which give rise to useless speculation and meaningless arguments rather than advancing God’s program of instruction which is grounded in faith [and requires surrendering the entire self to God in absolute trust and confidence].

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].