ΚΕΦΑΛΗ ΛΒ The Mountaineer in Liber CCCXXXIII, The Book of Lies by Aleister Crowley.
“Practise a thousand times, and it becomes difficult; a thousand thousand, and it becomes easy; a thousand thousand times a thousand thousand, and it is no longer Thou that doeth it, but It that doeth itself through thee. Not until then is that which is done well done.” [via]