I disapprove of what you say, but I will defend to the death your right to say it.
Probably the most often mis-attributed quote ever. It wasn’t in fact Voltaire that said this, but an early 20th century biographer that came up with the line. More here.
There are very, very few phrases by which I can say I live my life, but this is one.
I completely and utterly believe in the freedom to say what we wish, no matter how inherently false or offensive it may be. Yes, we shouldn’t shout “FIRE” in a theatre, but there are very very few situations outside of that in which freedom of speech should be compromised.