quod scripsi, scripsi What I have written, I have written.
vae soli Woe to the solitary person. (Ecclesiastes, 4:10)
animal bipes implume Two-legged, featherless animal (Plato)
Cogito, ergo sum (Rene Descartes - French philosopher, writer, scientist and mathematician.) I think, therefore I am.
ars longa, vita brevis Art is long, life is short. (Hippocrates, the ancient Greek physician)
ne puero gladium [Do not give] a sword to a boy.