Of all the forces in the universe, the hardest to overcome is the force of habit.
Johnny and the DeadThe habit of happiness is achieved through the attitude of gratitude.
Survive Life... And Live It UpGiving credit where credit is due is a very rewarding habit to form. Its rewards are inestimable.
Loretta YoungProvidentially, learned habits can be unlearned, especially in the context of moral groups.
Michael Shermer