Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.
Do not yield to Satan's enticements; rather, stand firm for truth. The unsatisfied yearnings of the soul will not be met by a never-ending quest for joy amidst the thrills of sensation and vice. Vice never leads to virtue. Hate never promotes love. Cowardice never gives courage. Doubt never inspires faith.
If a great country yields to a small country, it will conquer the small country. If a small country yields to a great country, it will be conquered by the great country.
If thou wishest to put an end to love, attend to business (love yields to employment); then thou wilt be safe.
[Lat., Qui finem quaeris amoris,
(Cedit amor rebus) res age; tutus eris.]
However we select from nature a complex [of phenomena] using the criterion of simplicity, in no case will its theoretical treatment turn out to be forever appropriate (sufficient).... I do not doubt that the day will come when [general relativity], too, will have to yield to another one, for reasons which at present we do not yet surmise. I believe that this process of deepening theory has no limits.
We will continue to ignore political and economic forecasts, which are an expensive distraction for many investors and
businessmen. Thirty years ago, no one could have foreseen the huge expansion of the Vietnam War, wage and price controls, two oil shocks, the resignation of a president, the dissolution of the Soviet Union, a one-day drop in the Dow of 508 points, or treasury bill yields fluctuating between 2.8% and 17.4%.