1. An excellent thing is as rare as it is difficult. (Spinoza)
2. A man’s reach should be beyond his grasp or what’s a heaven for. (Browning)
3. Frustra fit per plura quod potest fieri per pauciora. (Occam’s Razor) (Keep it simple!)
4. Nullius verba. (Horace - Motto of the Royal Society) (Take nobody’s word for it)
5. If ignorance is bliss, why aren’t more people happy? (anon)