Let no one trust so entirely to natural prudence as to persuade himself that it will suffice to guide him without help from experience.
Francesco GuicciardiniHow much luckier than all the rest of mankind are the astrologers who, if they tell one truth among a hundred lies, obtain so much credit that even their lies are believed.
Francesco GuicciardiniSince there is nothing so well worth having as friends, never lose a chance to make them.
Francesco GuicciardiniBe careful how you do one man a pleasure which must needs occasion equal displeasure in another. For he who is thus slighted will not forget, but will think the offence to himself the greater in that another profits by it; while he who receives the pleasure will either not remember it, or will consider the favour done him less than it really was.
Francesco Guicciardini