“Energy rests upon love; and come as it will, there's no forcing it.”

Address to the Society for Psychical Research (1897)
Context: The clock runs down. I lift the weight by exerting the proper amount of energy, and in this action the law of conservation of energy is strictly obeyed. But now I have the choice of either letting the weight fall free in a fraction of a second, or, constrained by the wheelwork, in twenty-four hours. I can do which I like, and whichever way I decide, no more energy is developed in the fall of the weight. I strike a match; I can use it to light a cigarette or to set fire to a house. I write a telegram; it may be simply to say I shall be late for dinner, or it may produce fluctuations on the stock exchange that will ruin thousands. In these cases the actual force required in striking the match or in writing the telegram is governed by the law or conservation of energy; but the vastly more momentous part, which determines the words I use or the material I ignite, is beyond such a law. It is probable that no expenditure of energy need be used in the determination of direction one way more than another. Intelligence and free will here come into play, and these mystic forces are outside the law of conservation of energy as understood by physicists.

Sādhanā : The Realisation of Life http://www.spiritualbee.com/spiritual-book-by-tagore/ (1916)
Context: In love all the contradictions of existence merge themselves and are lost. Only in love are unity and duality not at variance. Love must be one and two at the same time.
Only love is motion and rest in one. Our heart ever changes its place till it finds love, and then it has its rest. But this rest itself is an intense form of activity where utter quiescence and unceasing energy meet at the same point in love.
In love, loss and gain are harmonised. In its balance-sheet, credit and debit accounts are in the same column, and gifts are added to gains. In this wonderful festival of creation, this great ceremony of self-sacrifice of God, the lover constantly gives himself up to gain himself in love. Indeed, love is what brings together and inseparably connects both the act of abandoning and that of receiving.

So that what we've learnt on this show; You are responsible for your life and when you get that, everything changes, my friends. So don't wait for somebody else to fix you, to save you or complete you...
"Oprah Winfrey Show Finale" in CBS (25 May 2011)

What I Believe (1938)
Context: I realize that all society rests upon force. But all the great creative actions, all the decent human relations, occur during the intervals when force has not managed to come to the front. These intervals are what matter. I want them to be as frequent and as lengthy as possible, and I call them "civilization". Some people idealize force and pull it into the foreground and worship it, instead of keeping it in the background as long as possible. I think they make a mistake, and I think that their opposites, the mystics, err even more when they declare that force does not exist. I believe that it exists, and that one of our jobs is to prevent it from getting out of its box. It gets out sooner or later, and then it destroys us and all the lovely things which we have made. But it is not out all the time, for the fortunate reason that the strong are so stupid.

§ IV
1910s, At the Feet of the Master (1911)
Context: Of all the Qualifications, Love is the most important, for if it is strong enough in a man, it forces him to acquire all the rest, and all the rest without it would never be sufficient. Often it is translated as an intense desire for liberation from the round of births and deaths, and for union with God. But to put it in that way sounds selfish, and gives only part of the meaning. It is not so much desire as will, resolve, determination. To produce its result, this resolve must fill your whole nature, so as to leave no room for any other feeling. It is indeed the will to be one with God, not in order that you may escape from weariness and suffering, but in order that because of your deep love for Him you may act with Him and as He does. Because He is Love, you, if you would become one with Him, must be filled with perfect unselfishness and love also.
In daily life this means two things; first, that you shall be careful to do no hurt to any living thing; second, that you shall always be watching for an opportunity to help.
First, to do no hurt. Three sins there are which work more harm than all else in the world — gossip, cruelty, and superstition — because they are sins against love. Against these three the man who would fill his heart with the love of God must watch ceaselessly.

Laws of Motion, I
Philosophiae Naturalis Principia Mathematica (1687)

Physics and Philosophy (1942)

The Duty of Owning Books (1859)
Context: Books are the windows through which the soul looks out. A house without books is like a room without windows. No man has a right to bring up his children without surrounding them with books, if he has the means to buy them. It is a wrong to his family. He cheats them! Children learn to read by being in the presence of books. The love of knowledge comes with reading and grows upon it.

Reported in Dictionary of Burning Words of Brilliant Writers (1895) edited by Josiah Hotchkiss Gilbert, p. 225
1880s