"I clambered up to my attic where, during 6 entire months, I spent 14 hours a day, 7 days a week, immersed in probability theory, numerical analysis, and mathematical statistics."
- That's Nassim Taleb in the preface of his book, Dynamic Hedging: Managing Vanilla and Exotic Options
That probably sounds mundane and non-exotic but that's the only way to get deep into a subject and master it. Meditate on an idea to master it and master an idea to meditate it. That simple wisdom has stood the test of time.