“Earnestness means willingness to live with energy, though energy bring pain.”
Lectures XI, XII, AND XIII : "Saintliness" https://en.wikisource.org/wiki/The_Varieties_of_Religious_Experience/Lectures_XI,_XII,_and_XIII
1900s, The Varieties of Religious Experience (1902)
Context: One mode of emotional excitability is exceedingly important in the composition of the energetic character, from its peculiarly destructive power over inhibitions. I mean what in its lower form is mere irascibility, susceptibility to wrath, the fighting temper; and what in subtler ways manifests itself as impatience, grimness, earnestness, severity of character. Earnestness means willingness to live with energy, though energy bring pain. The pain may be pain to other people or pain to one's self — it makes little difference; for when the strenuous mood is on one, the aim is to break something, no matter whose or what. Nothing annihilates an inhibition as irresistibly as anger does it; for, as Moltke says of war, destruction pure and simple is its essence.
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William James 246
American philosopher, psychologist, and pragmatist 1842–1910Related quotes

“Love always brings difficulties, that is true, but the good side of it is that it gives energy.”
In his letter to Theo, from Nuenen, c. 9 March 1884, http://www.webexhibits.org/vangogh/letter/14/359.htm
1880s, 1884
Context: Love always brings difficulties, that is true, but the good side of it is that it gives energy.... I have not yet had enough experience with women. What we were taught about them in our youth is quite wrong, that is sure, it was quite contrary to nature, and one must try to learn from experience. It would be very pleasant if everybody were good, and the world were good, etc. - yes - but it seems to me that we see more and more that we are not good, no more than the world in general, of which we are an atom - and the world no more good than we are. One may try one's best, or act carelessly, the result is always different from what one really wanted. But whether the result be better or worse, fortunate or unfortunate, it is better to do something than to do nothing. If only one is wary of becoming a prim, self-righteous prig - as Uncle Vincent calls it - one may be even as good as one likes.

Harvard Business Review http://hbr.org/2011/03/lifes-work-norman-foster/ar/1

Source: 1980s, That Benediction is Where You Are (1985), p. 63
Context: Are we wasting our lives? By that word “wasting” we mean dissipating our energy in various ways, dissipating it in specialized professions. Are we wasting our whole existence, our life? If you are rich, you may say, “Yes, I have accumulated a lot of money, it has been a great pleasure.” Or if you have a certain talent, that talent is a danger to a religious life. Talent is a gift, a faculty, an aptitude in a particular direction, which is specialization. Specialization is a fragmentary process. So you must ask yourself whether you are wasting your life. You may be rich, you may have all kinds of faculties, you may be a specialist, a great scientist or a businessman, but at the end of your life has all that been a waste? All the travail, all the sorrow, all the tremendous anxiety, insecurity, the foolish illusions that man has collected, all his gods, all his saints and so on — have all that been a waste? You may have power, position, but at the end of it — what? Please, this is a serious question that you must ask yourself. Another cannot answer this question for you.

“Don't hold to anger, hurt or pain. They steal your energy and keep you from love.”

“Energy is of two kinds: 1. Energy of motion; 2. Energy of position.”
"Energy and Force" (Mar 28, 1873)
Source: Europe and the People Without History, 1982, Chapter 10, Crises and Differentiation in Capitalism, p. 298.