Necessity is the mistress and guide of nature.

Necessity is the theme and the inventress, the eternal curb and law of nature.

Necessity is the most powerful divinity the world knows--it is the result of physical forces set in operation by ethical forces.

Necessity, the mother of invention.

Necessity, the mother of invention.

Necessity is a great teacher.

Necessity is the mother of invention,

Necessity is the mother of invention.

Necessity is the mother of invention.

Necessity is the mother of all invention.

Necessity, they say, is the mother of invention, but it is the mother of any number of other things as well: sacrifice and monstrosity and metamorphosis. Necessity is the mother of all necessary things, to coin a tautology.

Art imitates Nature, and Necessity is the Mother of Invention.

One of the most powerful thoughts people have is the thought of necessity. It is much more than a thought. The word 'necessary' means 'it cannot be otherwise', and the Latin root means 'don't yield'. It suggests the emotional-physical stance of resisting, holding. That's the other side of the reflex system: when you say 'it cannot be otherwise', in effect your'e saying: 'It has got to be this way. I have to keep it this way'. You have a hold. Something that is necessary is a very powerful force which you can't turn aside. You may say 'I have to turn it aside.' Thus we establish an order of necessity, saying 'this turns aside for that, and this for that.'

It is important that we subscribe to the requirements of nature.