Only with gentlemen all day, not with villains.

This sentence comes from a couplet, which means to do things with people who have integrity, and not to argue with gossip. It emphasizes the importance of choosing the right people and things, and also reminds people to stay away from those who are immoral or gossip.

The meaning of this sentence is that gentlemen have noble character and correct way of doing things, and together with them, they can achieve great things. And villains often gossip, sow discord, and arguing with them will only waste energy and be meaningless. Therefore, you should choose to associate with gentlemen and avoid entanglement with villains in order to achieve your career.

In a word, this sentence tells us the importance of choosing a good teacher and a good friend and staying away from people and things that are unfavorable to us. At the same time, we should also pay attention to our own personality and way of doing things, and don't be a villain in the eyes of others, which will affect our life and career.