Very little is needed to make a happy life; it is all within yourself in your way of thinking.

The happiness of your life depends upon the quality of your thoughts.

The happiness of your life depends upon the quality of your thoughts: therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature.

The happiness of your life depends on the quality of your thoughts.

Come, Caesar, even by night - let stars delay; If thou but come, thy folk will find it day

Take away your opinion, and then there is taken away the complaint, 'I have been harmed.' Take away the complaint, 'I have been harmed,' and the harm is taken away.