Horace

"Saepa stilum vertas, iterum quae digna legi sint scripturas. (Turn the stylus [to erase] often if you would write something worthy of being reread.)."

"Adversity has the effect of eliciting talents which in prosperous circumstances would have lain dormant."

"Capture your reader, let him not depart, from dull beginnings that refuse to start."

"If matters go badly now they will not always be so."

"Knowledge without education is but armed injustice."