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The mass of a body is a measure of its energy content.
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"Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?" ("Does the inertia of a body depend upon its energy content?"), Annalen der Physik 18, 639-641 (1905). Quoted in Concepts of Mass in Classical and Modern Physics by Max Jammer (1961), p. 177.

 

Albert Einstein

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Mass democracy, mass morality and the mass media thrive independently of the individual, who joins them only at the cost of at least a partial perversion of his instincts and insights. He pays for his social ease with what used to be called his soul – his discriminations, his uniqueness, his psychic energy, his self.

 

Al Alvarez

 

Hata yoga is a way of working with the body, disciplining the body, purifying the body, preparing the body for higher levels of energy. All of us are alive; all of us are human beings, sitting here. But all of us do not experience life to the same intensity because our energy levels are not the same. Our pranic energies are not the same. Different people experience life in different levels of intensity. -Sadhguru

 

Jaggi Vasudev

 

The sex-energy is the greatest power of the mind and the body. This is the supreme strength in the human body, embodying all powers and assuming all forms. The mind and the body receive their strength and life from this sex-energy. Instead of allowing this Shakti or energy to become the gross seminal fluid, it is to be conserved, it is to be converted into a form of subtle energy called “Ojas” and thus made a source of spiritual life instead of the cause of physical death. With the extinction of sexual desires, the mind is released of its most powerful bond. Sex-energy moves towards two main directions, viz., one is downward and the other is upward. It takes the downward course in the form of gross sexual enjoyment; but when one tries to observe Brahmacharya (celibacy) in thought, word and deed, it takes the upward course. When the sex-energy always takes the downward course in a person, such a person becomes weak mentally and physically. From such a man or woman we cannot expect anything great and original. Sexual life dissipates the powers of the mind and the body.

 

Swami Narayanananda

 

A man cannot be wise enough to be a great artist without being wise enough to wish to be a philosopher. A man cannot have the energy to produce good art without having the energy to wish to pass beyond it. A small artist is content with art; a great artist is content with nothing except everything

 

Gilbert Keith Chesterton

 

Though it is folly to suppose that happiness is a matter of volition, and that we can make ourselves content and cheerful whenever we choose — a theory that many poor hypochondriacs are taunted with till they are nigh driven mad — yet, on the other hand, no sane mind is ever left without the power of self-discipline and self-control in a measure, which measure increases in proportion as it is exercised.

 

Dinah Craik