If Columbus had turned back, no one would have blamed him. No one would have remembered him, either.
The truth is that nobody ever knows you are at the edge of success, but giving up at any point in time will xpose you. Only those who dont QUIT will WIN. Quiters never Win.
Always do all you can when you can, and follow it to a successful end. Never believe those who tell you it's IMPOSSIBLE(they actually dont know any better). Stand your ground and fight for your dream. No one would have blamed Colombus, butmore importantly, no one would have remembered him.
Have a great day!