If in the opinion of the People, the distribution or modification of the Constitutional powers be in any particular wrong, let it be corrected by an amendment in the way which the Constitution designates. But let there be no change by usurpation; for though this, in one instance, may be the instrument of good, it is the customary weapon by which free governments are destroyed.
— George Washington

There are souls that are incurable and lost to the rest of society. Deprive them of one means of folly, they will invent ten thousand others. They will create subtler, wilder methods, methods that are absolutely DESPERATE. Nature herself is fundamentally antisocial, it is only by a usurpation of powers that the organized body of society opposes the natural inclination of humanity.
Antonin Artaud usurpation quote

The great constitutional corrective in the hands of the people against usurpation of power, or corruption by their agents is the right of suffrage; and this when used with calmness and deliberation will prove strong enough.
— Andrew Jackson

Above all we should not forget that government is an evil, a usurpation upon the private judgement and individual conscience of mankind.
— William Godwin

Fraud, robbery, and murder have characterized the English usurpation of the government of our country. Why, for the last fifty years we have been robbed in the matter of taxes of hundreds of millions.
— usurpation quotation by John Edward Redmond