The world will not reform for all your meddling.

As published in Le Misanthrope, Molière, tr. Curtis Hidden Page, G.P. Putnam’s Sons (1913), p. 12 | As contained in The Columbia Dictionary of Quotations, ed. Robert Andrews, Columbia University Press (1993), p.772 : ISBN 0231071949

Of all follies there is none greater than wanting to make the world a better place.