As long as the firmament of the You is spread over me, the tempests of causality cower at my heels, and whirl of doom congeals. - Martin Buber

Spirit in its human manifestation is man’s response to his You. Man speaks in many tongues - tongues of language, of art, of action - but the spirit is one; it is response to the You that appears from the mystery and addresses us from the mystery. Spirit is word. And even as verbal speech may first become word in the brain of man and then become sound in his throat, although both are merely refractions of the true event because in truth language does not reside in man but man stands in language and speaks out of it - so it is with all words, all spirit. Spirit is not in the I but between I and You. It is not like the blood that circulates in you but like the air in which you breathe. Man lives in the spirit when he is able to respond to his You. He is able to do that when he enters into this relation with his whole being. It is solely by virtue of his power to relate that man is able to live in the spirit.

Now, he no longer promises others the fulfillment of his duties, but promises himself the fulfillment of man.

When you spread forth your hands, I hide my eyes from you;
even though you make many prayers, I no longer listen; your hands are full of blood.
Wash yourselves; make yourselves clean; remove the evil of your doings from before my eyes;
cease to do evil, learn to do good; seek justice, correct oppression; defend the fatherless, plead for the widow.
Is that too little?