Obvious and Hidden Sins
1Tim 5:24 "Some men’s sins are clearly evident, preceding them to judgment, but those of some men follow later."
Paul is probably speaking in reference to verse 22 in the sense of authorizing men for ministry. In evaluating such candidates it must be kept in mind that while some men's sins are obvious to all, there are others who start off well but end poorly. Or it could be that such men are actively involved in sin, but secretly, only to be revealed on the judgement day. He's advising Timothy to scrutinize all candidates, regardless their reputation.