“He alone is an acute observer, who can observe minutely without being observed.”

“The prudent see only the difficulties, the bold only the advantages, of a great enterprise; the hero sees both; diminishes the former and makes the latter preponderate, and so conquers.”

“You are not very good if you are not better than your best friends imagine you to be.”

“Conscience is the virtue of observers and not of agents of action.”

“The aim and final reason of all music should be none else but the glory of God and refreshing the soul. Where this is not observed there will be no music, but only a devilish hubbub.”

“Error is related to truth as sleeping is to waking. I have observed that when one has been in error, one turns to truth as though revitalized.”

“Nobody could be an observer without being involved.”