Guy Murchie (1907-1997) wrote an inspiring book titled The Seven Mysteries of Life . He completed this book in 17 years. It is one of my favorite books. I return to it periodically for inspiration.
He was a school teacher, pilot, journalist, and photographer. He was a member of the Baha’i Faith. His books included Men on the Horizon (1932), Song of the Sky (1954), Music of the Spheres (1961) and The Seven Mysteries of Life (1978). Murchie also illustrated his books with etchings and woodcuts of his own making. The American Museum of Natural History awarded him the John Burroghs Medal in 1956 for Song of the Sky.
The short explanations of the seven mysteries in his words 
The Abstract Nature of Nature
“Abstraction, shows our world to be basically intangible behind the seeming solidity of matter and life.”
The Interrelatedness of All Creatures
“The Interrelatedness of all things, including animals, vegetables, minerals and stars.”
The Omnipresence of Life
“The Omnipresence of life everywhere in every kingdom, even in the superorganism of the Universe itself. “
The Polarity Principle
“The Polarity, the principle of symmetry expressed in polar opposites that interact and counterbalance throughout the worlds.”
“Transendence through the natural law of progression from finitude toward Infinitude, using the tools of time, space and self.”
The Germination of Worlds
“The Germination of the worlds, which happens once to every celestial organism and significantly is occurring now on Earth.”
“The seventh, the greatest and ultimate mystery of Divinity, which includes all mysteries and remains unknowable Essence behind Creation everywhere and forever.”
 Guy Murchie, “The Seven Mysteries of Life: An Exploration in Science and Philosophy” (1978), Houghton Mifflin, ISBN 0-395-26310-7