Voltaire...
He seems to have great quotes that apply equally to the right and left, depending on interpretation.
Timeless.

“Judge a man by his questions rather than by his answers.”
“‎Life is a shipwreck, but we must not forget to sing in the lifeboats.”
“It is forbidden to kill; therefore all murderers are punished unless they kill in large numbers and to the sound of trumpets.”
“Those who can make you believe absurdities, can make you commit atrocities.”
“I have never made but one prayer to God, a very short one: Oh Lord, make my enemies ridiculous. And God granted it."
“God is a comedian playing to an audience that is too afraid to laugh.”
“Every man is guilty of all the good he did not do.”
“Dare to think for yourself.”
“It is dangerous to be right in matters on which the established authorities are wrong.”
“If God did not exist, it would be necessary to invent him.”
“No opinion is worth burning your neighbor for.”
“He must be very ignorant for he answers every question he is asked.”
“What can you say to a man who tells you he prefers obeying God rather than men, and that as a result he's certain he'll go to heaven if he cuts your throat?”
“In general, the art of government consists in taking as much money as possible from one party of the citizens to give to the other.”
“If there’s life on other planets, then the earth is the Universe’s insane asylum.”