Gandhi's development resulted from extraordinary intellectual and moral forces in combination with political ingenuity and a unique situation. I think Gandhi would have been Gandhi even without Thoreau and Tolstoy.
Now Mr. Frankfurt (described by PUP as one our most influential moral philosophers). We especially like the following:
... although bulls**t can take many innocent forms, excessive indulgence in it can eventually undermine the practitioner's capacity to tell the truth in a way that lying does not. Liars at least acknowledge that it matters what is true. By virtue of this, bulls**t is a greater enemy of the truth than lies are ...