When you have spoken the word, it reigns over you. When it is unspoken you reign over it.
-Arabian proverb
A not-entirely-different quote has been posted in the past
The words "I am..." are potent words; be careful what you hitch them to. The thing you're claiming has a way of reaching back and claiming you.
–A.L. Kitselman
Here's another installment of rationality quotes. The usual rules apply: