"Knowing is not enough; we must apply!" Johann Wolfgang von Goethe The author of Faust, a friend of Beethoven, literature, and music, makes a logical recommendation. What is the use of knowing if you are not going to apply it? Well, I see a third way, if you learn something and you can't apply it, at least teach it to others. Besides, there will always be things to learn that will need favorable conditions to be applied. Many of Leonardo's or Tesla's inventions were based on the knowledge that needed undeveloped knowledge to be applied. But they left some sketches and documentation of their experiments that others many years later were able to apply. In any case, Goethe is quite right. Karl Joseph Stieler - Transferred from nds.wikipedia to Commons..org by G.Meiners at 12:05, 15. Okt 2005.