It grows into a habit, unknown to its possessors.The habit may be strong, but it may be cured when those who have it are convinced of its bad effects on their congeniality.

• 之后作者运用因果说明的手法来讨论这些不会愉快的人是如何形成的这种总是挑剔别人、招人厌烦的性情，为什么要改掉这样的习惯。