"As faith in mankind, Israel's faith is hope. And it is this epitome of Israel's prophetism, this hope in mankind's future, that comprises the substance of the messianic idea."

“Love of God implies love of religion. And religion exemplifies that creative spirit of God which is at work in history as well as in the mind of man. Thus, one ought to love any religion, that is, religion as such, and in any form—as a manifestation of the moral spirit, the divine spirit of mankind.”

“Wherever rights are denied the poor, the prophetic anger is turned not merely against the incumbent rulers but equally against the means society employs to gloss over its own mendacity. And foremost among these means is art. Catering to luxury and emphasizing only the beautiful, art denies the fact that wretchedness and destitution have a tight grip on the poor. This is the reason why the prophetic zeal turned against art, and not merely against the luxury of women and the pretentiousness of the rich.”

“Man's hope is transformed into faith when he no longer thinks of himself alone, that is, of his salvation here and now, or of his eternal salvation . Hope is transformed into faith when man associates the future with the emergence of a community whose concerns will reach beyond its everyday concrete reality. Such a community will not be composed merely of man's immediate circle of friends or family nor will it include only those who share his own cherished beliefs; indeed, it will even cut across the borders of his own country because it will represent the community of mankind.”

“Only the idea of God gives me the confidence that morality will become reality on earth. And because I cannot live without this confidence, I cannot live without God.”

“Ethics must not remain a lovely abstraction; it must be concretized into valid truth. At this point ethics joins forces with religion because ethics too has ultimately no other recourse but to hypothesize the idea of God: not for the personal redemption of the moral individual but as a guarantee for the eventual realization of morality in this world.”