I have started re-reading “the Complete Golden Dawn System of Magic” by Israel Regardie, and towards the beginning there is this quote which I am posting as a reminder to myself more than anything else, although it may be of help to others:
Nothing in the world can take the place of persistence.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent.
(Nerdy bonus: The book itself does not give a source for this quote, but a quick Google search showed it to be a pearl of wisdom offered by Calvin Coolidge, who was President of the United States between 1923 and 1929.)