Henri Poincaré·1908These sudden inspirations never happen except after some days of voluntary effort which has appeared absolutely fruitless. The role of this unconscious work in mathematical invention appears to me incontestable. Rest gives back to the mind its force and freshness.
Winston Churchill·1940Sure I am of this, that you have only to endure to conquer. You have only to persevere to save yourselves, and to save all those who rely upon you. You have only to go right on, and at the end of the road, be it short or long, victory and honor will be found.
Thomas Edison·1910Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.
