Man's ultimate concern must be expressed symbolically, because symbolic language alone is able to express the ultimate.

Man and nature belong together in their created glory – in their tragedy and in their salvation.

Doubt is the necessary tool of knowledge.

Existential anxiety of doubt drives the person toward the creation of certitude of systems of meaning, which are supported by tradition and authority. Neurotic anxiety builds a narrow castle of certitude which can be defended with the utmost certainty.

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!

There is no condition for forgiveness.

He who risks and fails can be forgiven. He who never risks and never fails is a failure in his whole being.