In this book it is spoken of the Sephiroth and the Paths; of Spirits and Conjurations; of Gods, Spheres, Planes, and many other things which may or may not exist.
It is immaterial whether these exist or not. By doing certain things certain results will follow; students are most earnestly warned against attributing objective reality or philosophic validity to any of them.
Aleister Crowley, Liber O vel Manus et Sagittae sub figurâ VI
God is never so turned away from man, and never so much sendeth him new paths, as when he maketh ascent to divine speculations or works in a confused or disordered manner, and as it adds, with unhallowed lips, or unwashed feet. For of those who are thus negligent, the progress is imperfect, the impulses are vain, and the paths are dark.
Zoroaster, quoted at The Herb Dangerous, Part II: The Psychology of Hashish by Oliver Haddo (Aleister Crowley)
He knew then there was no going back. All paths were closed to him except the plain horror of the present.
Matthew Lowes, Old Growth