Act as if ...

Action erodes depression.

We are judged by our actions, not on our feelings or temptations.

To make progress in the spiritual life, we often have to act against our feelings (Latin: agere contra).

C. S. Lewis, Mere Christianity.

Do not waste your time bothering whether you ‘love’ your neighbor. Act as if you did. As soon as we do this, we find one of the great secrets. When you are behaving as if you loved someone, you will presently come to love him. If you inquire about someone you dislike, you will find yourself disliking him more. If you do him a good turn, you will find yourself disliking him less.