Plato

COURAGE HAS BEEN DEFINED TO BE INTELLIGENCE OR KNOWLEDGE OF THE TERRIBLE; AND COURAGE IS NOT ALL VIRTUE, BUT ONLY ONE OF THE VIRTUES. THE TERRIBLE IS IN THE FUTURE, AND THEREFORE THE KNOWLEDGE OF THE TERRIBLE IS A KNOWLEDGE OF THE FUTURE. BUT THERE CAN BE NO KNOWLEDGE OF FUTURE GOOD OR EVIL SEPARATED FROM A KNOWLEDGE OF THE GOOD AND EVIL OF THE PAST OR PRESENT; THAT IS TO SAY, OF ALL GOOD AND EVIL. COURAGE, THEREFORE, IS THE KNOWLEDGE OF GOOD AND EVIL GENERALLY.