Doubt is the necessary tool of knowledge.

There is faith in every serious doubt, namely, the faith in the truth as such, even if the only truth we can express is our lack of truth.

I loved thee beautiful and kind, And plighted an eternal vow; So altered are thy face and mind, t'were perjury to love thee now!

The courage to be is the courage to accept oneself, in spite of being unacceptable.

The abundance of a grateful heart gives honor to God even if it does not turn to Him in words. An unbeliever who is filled with thanks for his very being has ceased to be an unbeliever.

Theology moves back and forth between two poles, the eternal truth of its foundations and the temporal situation in which the eternal truth must be received.

Love is the infinite which is given to the finite.