How do you measure whether or not a strategy of economic growth that is articulated by a very smart, capable economist actually yields growth? You can't. But you can influence.
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.
Poets and men of action differ: the former yield to their feelings in order to reproduce them in lively colors, and therefore judge only ex post facto; the latter feel and judge at one and the same time.
To be angry is to yield to the influence of Satan. No one can make us angry. It is our choice. If we desire to have a proper spirit with us at all times, we must choose to refrain from becoming angry. I testify that such is possible.
Crush humanity out of shape once more, under similar hammers, and it will twist itself into the same tortured forms. Sow the same seeds of rapacious licence and oppression over again, and it will surely yield the same fruit according to its kind.
Humor is the great thing, the saving thing after all. The minute it crops up, all our hardnesses yield, all our irritations, and resentments flit away, and a sunny spirit takes their place.
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.
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.]