"Never play cards with a man called Doc. Never eat at a place called Mom's. Never sleep with a woman whose troubles are worse than your own-Nelson Algren.
Mejor estar solo que mal accompanado-Old Cuban saying which means: "It's better to be alone than poorly accompanied."
"Mas sabe' el Diablo por ser viejo, que por ser diablo". The Devil knows more because he is old, than because he is the Devil, meaning to respect someone whose experience in any field may be much greater than yours.
If you ask for directions as to how to get to a given location, and the person whom you're asking includes the phrase, "You can't miss it," anywhere in said directions, then you'd better look at a map if you actually want to get where you're going.