Repetition of the same thought or physical action develops into a habit which, repeated frequently enough, becomes an automatic reflex.
It is indeed possible for those who have the will, courage and faith.
Be interesting, be enthusiastic... and don't talk too much.
The bigger your problems, the bigger your prayer should be.
Remember: what you think you will become - good or bad, weak or strong, defeated or victorious.
Practice hope. As hopefulness becomes a habit, you can achieve a permanently happy spirit.