He was thinking alone and seriously racking his brain to find a direction for this single force four times multiplied with which he did not doubt as with the lever for which Archimedes sought they should succeed in moving the world when some one tapped gently at his door.
Shun no toil to make yourself remarkable by some talent or other yet do not devote yourself to one branch exclusively. Strive to get clear notions about all. Give up no science entirely for science is but one.
