Toleration is the greatest gift of the mind.
What other nations call religious toleration, we call religious rights. They are not exercised in virtue of governmental indulgence, but as rights, of which government cannot deprive any portion of citizens, however small.
Richard Mentor Johnson
The idea so commonly found that scepticism leads to toleration arises from considering the effects of scepticism in the intellectual who takes no active part - not its effects in the man of action. In the man of action, moral relativism and scepticism as to the absolute and universal value of his priunciples are no obstacle to a fanatical belief in their immediate value as his own clan at the actual moment; they do not weaken in the least his will to impose his principles. How should he glimpse a soul of truth in the principles of others, entitling them to respect, when he does not believe in noble origins of this kind even for his own principles?
Bertrand de Jouvenel
In the Christian world, as you remember, Christianity is in the 21st century, Islam is in the 15th century. I don't mean to say that Islam is backward; I mean to say that there are certain experiences that it hasn't gone through. Christianity had the great religious wars of the 17th century. Islam, fortunately for the Muslims, did not have that. Christianity worked out a system of toleration. Islam was always more tolerant of Christendom.
Loyalty in a free society depends upon the toleration of disloyalty.