Robert Jackson said this quote

But freedom to differ is not limited to things that do not matter much. That would be a mere shadow of freedom. The test of substance is the right to differ as to things that touch the heart of the existing order.

~ Robert Jackson

If there is any fixed star in our constitutional constellation, it is that no official, high or petty, can prescribe what shall be orthodox in politics, nationalism, religion, or other matters of opinion, or force citizens to confess by word or act.

~ Robert Jackson

The day that this country ceases to be free for irreligion, it will cease to be free for religion.

~ Robert Jackson

To believe that patriotism will not flourish if patriotic ceremonies are voluntary... is to make an unflattering estimate of the appeal of our institutions to free minds.

~ Robert Jackson