Hi. I don't know much about physics, and I wanted to get into some mathematical physics. I want to learn, from a mathematician's perspective, quantum mechanics and general relativity (and if I am right these are two most popular "flavours" of mathematical physics?). Someone (not a physicist) recommended Gustafson/Sigal "Mathematical Methods in Quantum Mechanics" and Wald's "General Relativity." Now I do know that there are books that grad students in physics usually look at. Goldstein, Jackson, Sakurai, etc. Do I need to look at those first? Or can I just jump into those two books? Also if you have some other suggestions that would be great.