Power of thought

"There is a thought in your mind right now. The longer you hold on to it, the more you dwell upon it, the more life you give to that thought. Give it enough life, and it will become real. So make sure the thought is indeed a great one."
-- Ralph Marston

"Man is made or unmade by himself. In the armory of thought he forges the weapons by which he destroys himself. He also fashions the tools with which he builds for himself heavenly mansions of joy and strength and peace."
-- William James