Even though many people prove to be ungrateful, do not let that stop you from benefiting others-for not only is beneficence in itself a noble and almost divine quality, it may also happen that while you practice it, you will encounter someone so grateful that he will make up for all the others' ingratitude.
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