Menachem Mendel of Kotzk quotes:

Peace without truth is a false peace.

God is only where you let Him in.

When a man makes a reverent face before a face that is no face - that is idol worship!

Do not be satisfied with the speech of your lips and the thought in your heart, all the promises and good sayings in your mouth, and all the good thoughts in your heart; rather you must arise and do!

First, a man is created in his own image, and only afterwards in the image of God.

God dwells where we let God in.

One ought to be mixed up with the world and to be able to wash one's hands of it - to be part of the world and also outside it. One [needs] to be both involved and detached at the same time.

There is nothing as whole, or as perfect, as a broken heart.

People are accustomed to look at the heavens and to wonder what happens there. It would be better if they would look within themselves, to see what happens there.