Manly P. Hall (1901-1990) was Canadian-American mystic. Astronaut Edgar Mitchell said,
"Manly Hall's great work is a classic in the world's literature. It will guide historians, philosophers, and lay seekers of esoteric wisdom for centuries." (Wikiquote)
The rest of this post is some quotes from Hall.
Life
"There are many levels of life which we cannot see and know, yet which certainly exist. There is a larger world, vast enough to include immortality... Our spiritual natures belong to this larger world." (AZQuotes.com)
"We can only escape from the world by outgrowing the world. Death may take man out of the world but only wisdom can take the world out of the man. As long as the human being is obsessed by worldliness, he will suffer from the karmic consequences of false allegiances. When however, worldliness is transmuted into spiritual integrity he is free, even though he still dwells physically among worldly things." (Horizon, 1949)
"Man's security comes from within himself." (AZQuotes.com)
Wisdom
"Wisdom is a condition of consciousness rather an attitude of mind. Wisdom is that state of being in which an individual finds himself when realization has tinctured and transmuted all attitudes and opinions. A wise man is one who has experienced wisdom, wisdom in this sense being a mystical experience" (First Principles of Philosophy: The Science of Perfection, 1935)
"There exists in the world today, and has existed for thousands of years, a body of enlighted humans united in what might be termed, an Order of the Quest... For those who have come to a stage of wisdom then belong to a family of heroes-perfected human beings." (AZQuotes.com)
"It must be shown that self-seeking is out of fashion, and that the world is moving on to a larger conception of living." (AZQuotes.com)
