Plato’s Phaedo 85.c

Well spoke , said Simmias. I will tell you my difficulty , and then Cebes will say he no accept what was said. I believe, as perhaps you do, that precise knowledge on that subject is impossible or extremely difficult in our present life, but that it surely shows a very poor spirit not to examine thoroughly what is said about it, and to desist before one is exhausted by an all-round investigation. One should ¬†achieve one of these things: learn the truth about these things or find it out for oneself, or, if that is impossible, adopt the best and most irrefutable of men’s theories, and, ¬†borne upon this, sail through the dangers of life as upon a raft, unless someone should make that journey safer and less risky upon a firmer vessel of some divine doctrine.