Watch your thoughts; they become words.
Watch your words; they become actions,
Watch your actions; they become habits.
Watch your habits; they become character.
Watch your character; it becomes your destiny.
For source see here – http://quoteinvestigator.com/2013/01/10/watch-your-thoughts/
I found this in Richard Rohr’s book ‘Breathing Under Water: spirituality and the twelve steps’