You will encounter many distractions and many temptations to put your goal aside: The security of a job, a wife who wants kids, whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
If you were a medieval scholar reading a book, you knew that there was a reasonable likelihood you'd never see that particular text again, and so a high premium was placed on remembering what you read. You couldn't just pull a book off the shelf to consult it for a quote or an idea.

