Balance every thought with its opposition. Because the marriage of them is the destruction of illusion.

When one walks, one is brought into touch first of all with the essential relations between one's physical powers and the character of the country; one is compelled to see it as its natives do. Then every man one meets is an individual.

The more necessary anything appears to my mind, the most certain it is that I only assert a limitation.

We can no longer assert any single proposition, unless we guard ourselves by enumerating countless conditions which must be assumed.

To use legal or financial constraint to compel either abstention or submission, is entirely horrible, unnatural and absurd.

The joy of life consists in the exercise of one's energies, continual growth, constant change, the enjoyment of every new experience. To stop means simply to die. The eternal mistake of mankind is to set up an attainable ideal.

Indubitably, magic is one of the subtlest and most difficult of the sciences and arts. There is more opportunity for errors of comprehension, judgment and practice than in any other branch of physics.