Sorry Madam!"Man is born free but everywhere he is in chains" is what Roausseau commented when Diderot was sent behind the bar for his encyclopedia.It's not Voltaire...
A grave error from a Professor of a reputed University. "Man is born free but everywhere is in chains" is the very first sentence of the renowned work of Rousseau, 'The Social Contract'. It's not Voltaire's sentence. I think this is known even to high-school students.