If you really want to contribute to our theoretical understanding of physical laws — and it is an exciting experience if you succeed! — there are many things you need to know. First of all, be serious about it!
— Gerard 't Hooft, How to become a good theoretical physicist
Source: http://www.phys.uu.nl/~thooft/theorist.html
From his web essay 'How to become a good theoretical physicist'.
Topics: learning