Victor E. Frankl on success and happiness

[S]uccess, like happiness, cannot be pursued; it must ensue, and it only does so as the unintended side-effect of one's dedication to a cause greater than oneself or as the by-product of one's surrender to a person other than oneself. Happiness must happen, and the same holds for success: you have to let it happen by not caring about it.

~ Victor E. Frankl, Man's Search For Meaning, Preface to the 1992 Edition, pp. xiv-xv