“Necessity is the mother of all invention.”

“To invent something, all you need is imagination and a big pile of junk.”

“A man's actions are determined by necessity, external and internal.”

“No man or Genie on earth had "created" anything, we merely assembled God's Atoms, by learning it's properties, with his aid, so if anyone said that we had "invented" anything - he had Invented a lie; an unwise man.... thinks we have created an atom.”

“It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.”

“A photograph never grows old. You and I change, people change all through the months and years but a photograph always remains the same. How nice to look at a photograph of mother or father taken many years ago. You see them as you remember them. But as people live on, they change completely. That is why I think a photograph can be kind.”

“Concepts that have proven useful in ordering things easily achieve such authority over us that we forget their earthly origins and accept them as unalterable givens. Thus they come to be stamped as “necessities of thought”, “a priori givens”, etc. The path of scientific advance is often made impassable for a long time through such errors. For that reason, it is by no means an idle game if we become practiced in analyzing the long commonplace concepts and exhibiting those circumstances upon which their justification and usefulness depend, how they have grown up, individually, out of the givens of experience. By this means, their all-too-great authority will be broken. They will be removed if they cannot be properly legitimated, corrected if their correlation with given things be far too superfluous, replaced by others if a new system can be established that we prefer for whatever reason.”