Consider this:
It is hard work to control the workings of inclination and turn the bent of nature; but that it may be done, I know from experience. God has given us, in a measure, the power to make our own fate; and when our energies seem to demand a sustenance they cannot get–when our will strains after a path we may not follow–we need neither starve from inanition, nor stand still in despair: we have but to seek another nourishment for the mind, as strong as the forbidden food it longed to taste–and perhaps purer; and to hew out for the adventurous foot a road as direct and broad as the one Fortune has blocked up against us, if rougher than it.
– St. John Rivers, speaking to Jane Eyre about ambition.
(From the novel Jane Eyre, by Charlotte Brontë.)