Actually, many people simply can’t handle real sincerity.

Once you are sincere with them, they become greedy and arrogant instead.
In psychology, it’s said that people simply can’t give what they don’t have.
People of good character—if you show them 5 out of 10 sincerity, they would want to produce 10 out of 10 true heart to repay you.
But for those with poor character, the more sincere you are with them, the more they will go too far, and then treat you as a weak person，