Knowledge of life in the astral world leads us to a conclusion of fundamental importance, namely that the physical world is the product of the astral world.

The science of the future will be based on sympathetic vibrations.

Intuition is the conscious experience - in pure spirit - of a purely spiritual content.

The student of mathematics must get rid of all arbitrary thinking and follow purely the demands of thought. In thinking in this way, the laws of the spiritual world flow into him. This regulated thinking leads to the most spiritual truths.

For every step in spiritual perception, three steps are to be taken in moral development.

Without common sense, all thine efforts are in vain.

You'll be able to gain insight and reach a conclusion only by applying the powers of mind, intellect, soul, heart, spirit, and imagination. This is what 'looking at something spiritually' really means.