You cannot discover new oceans unless you have the courage to lose sight of the shore.-means: You cannot discover anything new unless you take a chance.
He who lives among wolves soon starts to howl.-means: You start to resemble the people you hang out with.
The elephant does not feel a flea-bite.-means: The small things shouldn't bother you.
The good seaman is known in bad weather.-means: The good people only get noticed in bad situations.