Opposition comes not only from your enemies but sometimes from your friends, and the latter is much more difficult to face. You have to have physical courage, because very often going along the path of your choice is full of physical handicap hardship.
Whenever you take a step forward, you are bound to disturb the air as you go forward you disturb the dust, the ground. You trample upon things. When whole society moves forward, this trampling is on a much bigger scale; and each thing that you disturb, each vested interest which you want to remove, stands as an obstacle.
Without courage, you cannot practice any other virtue. You have to have courage – courage of different kinds: first, intellectual courage, to sort out different values and make up your mind about which is the one which is right for you to follow. You have to have moral courage to stick up to that – no matter what comes in your way, no matter what the obstacle and the opposition is.