No tree, it is said, can grow to heaven unless its roots reach down to hell.

We should not pretend to understand the world only by the intellect. The judgement of the intellect is only part of the truth.

To the critical intelligence, nothing is left of absolute reality.

The principle aim of psychotherapy is not to transport one to an impossible state of happiness, but to help (the client) acquire steadfastness and patience in the face of suffering.

To be normal is the ultimate aim of the unsuccessful.

The capacity for inner dialogue is a touchstone for outer objectivity.

In the second half of life the necessity is imposed of recognizing no longer the validity of our former ideals but of their contraries. Of perceiving the error in what was previously our conviction, of sensing the untruth in what was our truth, and of weighing the degree of opposition, and even of hostility, in what we took to be love.