“Whatever is worth doing at all is worth doing well.”

“Be wiser than other people if you can; but do not tell them so.”

“Never seem more learned than the people you are with. Wear your learning like a pocket watch and keep it hidden. Do not pull it out to count the hours, but give the time when you are asked.”

“The world can doubtless never be well known by theory: practice is absolutely necessary.”

“Many a man would rather you heard his story than grant his request.”

“Jangan memaksa orang mendengarkan anda, sebab kalau orang tidak mau mendengarkan anda, lebih baik tutup mulut.”

“Sikap yang santun harus menghiasi orang yang berpengetahuan dan melicinkan jalannya dalam pergaulan.”