Habit

Habit is the cumulative effect of our tendencies , behaviours and actions of past several lives. Therefore, what we get in present life is our sanskaras. It is very difficult to change this acquired trait . It takes a very great effort of will to resist or  to change slightly some particular habit or temptation and throw it out of mind altogether. It needs both physical and mental effort for applying an emotional act to check a habit.
Good qualities are needed for spiritual development, depend initially on good habits. Good habits give us true strength.