Many love this: Victory attained by violence is tantamount to a defeat, for it is momentary. (by Mahatma Gandhi)
But this is one I have not heard of until today: It is better to be violent, if there is violence in our hearts, than to put on the cloak of nonviolence to cover impotence. (by same guy)
From this point of view, I see Gandhi's greatness.
Some has called the second quote fictional. So I looked further:
It is not fictional.
I downloaded a djvu format. Used DjView (a djvu viewer) to search for the phrase and found it in page 254 of Gandhi's Non-Violence in Peace and War Volume I.
The quote is followed by an interesting line:
Violence is any day preferable to impotence. There is hope for a violent man to become non-violent. There is no such hope for the impotent.