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Einstein to Sommerfeld in 1912 while building the General Theory of Relativity:
"I am exclusively occupied with the problem of gravitation and hope with the help of a local mathematician friend to overcome all the difficulties. One thing is certain, however, that never in life have I been quite so tormented. A great respect for mathematics has been instilled within me, the subtler aspects of which, in my stupidity, I regarded until now as pure luxury." -- J. Mehra, The Physicist's Conception of Nature, pg. 93.
We continued out discussion of General Relativity. With respect to the Supplementary Notes, we discussed material also discussed in: