Imagination that compares and contrasts with what is around as well as what is better and worse is the living power and prime agent of all human perception judgement and emotional reaction.
All Science is necessarily prophetic, so truly so, that the power of prophecy is the test, the infallible criterion, by which any presumed Science is ascertained to be actually & verily science. The Ptolemaic Astronomy was barely able to prognosticate a lunar eclipse; with Kepler and Newton came Science and Prophecy.
With no other privilege than that of sympathy and sincere good wishes, I would address an affectionate exhortation to the youthful literati, grounded on my own experience. It will be but short; for the beginning, middle, and end converge to one charge: NEVER PURSUE LITERATURE AS A TRADE.