necessity is the mother of invention
The primary driving force for most new inventions is a need.
noun
The quality or state of being necessary, unavoidable, or absolutely requisite.
I bought a new table out of necessity. My old one was ruined.
Educating the public about some of the myths that underlie their fears that non-traditional families will of necessity be detrimental to the well-being of foster children.
The condition of being needy; desperate need; lack.
For it is in vain for a man to think to seek God in his necessity and exigence, if he seek not God in his ordinances, and do not joy in them.
Something necessary; a requisite; something indispensable.
A tent is a necessity if you plan on camping.
Look for the bare necessities / The simple bare necessities / Forget about your worries and your strife
Something which makes an act or an event unavoidable; an irresistible force; overruling power.
After eating a full meal, the human body's necessity for food will compel the person to eat again in the future.
I stopped, and said with inly muttered voice, 'It doth not love the shower, nor seek the cold: This neither is its courage nor its choice, But its necessity in being old.
The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.