Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed.
— Martin Luther King, Jr.

To let friendship die away by negligence and silence is certainly not wise. It is voluntarily to throw away one of the greatest comforts of the weary pilgrimage.
Samuel Johnson voluntarily quote

The closer and more confidential our relationship with someone, the less we are entitled to ask about what we are not voluntarily told.
— Louis Kronenberger

As a part of their conditioning, women voluntarily prostitute themselves into the auction and groom themselves toward the highest exchange.
— Bryant H. McGill

Free-market capitalism is a network of free and voluntary exchanges in which producers work, produce, and exchange their products for the products of others through prices voluntarily arrived at.
— Murray N. Rothbard