The mother of useful arts is ...

The mother of useful arts is necessity; that of the fine arts is luxury. For father the former has intellect; the latter genius, which itself is a kind of luxury.
The mother of useful arts is necessity; that of the fine arts is luxury. For father the former has intellect; the latter genius, which itself is a kind of luxury.

Quotes from the same author

Every man takes the limits of his own field of vision for the limits of the world.
In action a great heart is the chief qualification. In work, a great head.
If children were brought into the world by an act of pure reason alone, would the human race continue to exist? Would not a man rather have so much sympathy with the coming generation as to spare it the burden of existence, or at any rate not take it upon himself to impose that burden upon it in cold blood?
A man of business will often deceive you without the slightest scruple, but he will absolutely refuse to commit a theft.
The first forty years of life give us the text; the next thirty supply the commentary on it.