Don't think. Take action.
"Don't think. Take action" is one of the quotes that has helped me more lately. I just think too much. I should do more.
More specifically this quote I found interesting: “You can’t think your way into right action, but you can act your way into right thinking.” I heard this quote on https://www.actualized.org/articles/how-to-stop-being-lazy where the blogger gave credit of this quote to William James. Further research showed that this quote may be of Bill Wilson: http://www.goodreads.com/quotes/805288-you-can-t-think-your-way-into-right-action-but-you. Nonetheless William James has a similar quote: “Actions seems to follow feeling, but really actions and feeling go together; and by regulating the action, which is under the more direct control of the will, we can indirectly regulate the feeling, which is not. Thus the sovereign voluntary path to cheerfulness, if our cheerfulness be lost, is to sit up cheerfully and to act and speak as if cheerfulness were already there.” which is also nice.