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.