The starting-point and chief principle of every science, and hence of theology also, is not only methodical doubt, but positive doubt. One can believe only what one has perceived to be true from reasonable grounds, and consequently one must have the courage to continue doubting until one has found reliable grounds to satisfy the reason.

From one Soul of the Universe are all Souls derived.

The soul passeth from form to form; and the mansions of her pilgrimage are manifold.

The impious soul, however, punishes itself by seeking a human body to enter into, for no other body can receive a human soul; it cannot enter the body of an animal devoid of reason. Divine law preserves the human soul from such infamy... The soul passeth from form to form; and the mansions of her pilgrimage are manifold. Thou puttest off thy bodies as raiment; and as vesture dost thou fold them up. Thou art from old, O Soul of Man; yea, thou art from everlasting.

Prayer is the chief thing that man may present unto God.

Death is like an arrow that is already in flight, and your life lasts only until it reaches you.

Not all human souls but only the pious ones are divine.