E=mc2. Energy equals mass times the speed of light squared. The original statement is: If a body gives off the energy L in the form of radiation, its mass diminishes by L/c2. Ist die Tragheit eines Korpers von Seinem Energieghalt Abhangig? 1905
We read many books, but that does not bring us knowledge. We may read all the Bibles in the world, but that will not give us religion. Theoretical religion is easy enough to get, any one may get that. What we want is practical religion.
There was no solution, save that universal solution which life gives to all questions, even the most complex and insolvable: One must live in the needs of the day--that is, forget oneself.
The Lord says, 'Whoever has, to him shall be given' (Mt. 13:12). He will give, then, to those who have; that is to say, if they use freely and cheerfully what they have received, He will add to and perfect His gifts.
I am jealous of everything whose beauty does not die. I am jealous of the portrait you have painted of me. Why should it keep what I must lose? Every moment that passes takes something from me and gives something to it. Oh, if it were only the other way! If the picture could change, and I could be always what I am now! Why did you paint it? It will mock me some day—mock me horribly!
The true bounds and limitations, whereby human knowledge is confined and circumscribed,... are three: the first, that we do not so place our felicity in knowledge, as we forget our mortality: the second, that we make application of our knowledge, to give ourselves repose and contentment, and not distates or repining: the third, that we do not presume by the contemplation of Nature to attain to the mysteries of God.