A certain amount of opposition is a great help to a man. Kites rise against, not with, the wind.Lewis Mumford
Great spirits have always encountered opposition from mediocre minds. The mediocre mind is incapable of understanding the man who refuses to bow blindly to conventional prejudices and chooses instead to express his opinions courageously and honestly.Albert Einstein
When a true genius appears, you can know him by this sign: that all the dunces are in a confederacy against him.Jonathan Swift
All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.Arthur Schopenhauer