Authors:

He knows not how to speak who cannot be silent; still less how to act with vigour and decision. - Who hastens to the end is silent: loudness is impotence.

"Aphorisms on man. Translated from the original manuscript of the Rev. John Caspar Lavater, citizen of Zuric. ; [One line from Juvenal]" by Johann Kaspar Lavater, 1790.
He knows not how to speak who cannot be silent; still less how to act with vigour and decision. - Who hastens to the end is silent: loudness is impotence.