It is absolutely necessary to remember that all living things, trees and shrubs, and you and me included, have to have a means of generating the energy that will overcome all the forces and influences that seek to get us down. Now, life is full of influences to get us down. Emotional, psychological and, of course, physical. Though we think immediately of gravity, psychological forms are just as powerful in many cases in forcing us to sink down.
Walter Carrington (“Thinking Aloud” – Generating the Energy to Go Up p29)