Necessity is the mother of all invention.
Money only appeals to selfishness and always tempts its owners irresistibly to abuse it. Can anyone imagine Moses, Jesus, or Gandhi armed with the money-bags of Carnegie?
I do not like to state an opinion on a matter unless I know the precise facts.
It is important to foster individuality, for only the individual can produce the new ideas.
Common sense is that layer of prejudices which we acquire before we are sixteen.
If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.