The fist number of L. refer to the standard CtP edition published in 1987. The following number shows correspondence between letters in the new 2010 edition. Note that on this website CtP is available only 1987 edition with minor additions.

[L. 125 | 135] 10 May 1964

I received a copy of the 'Hibbert Journal' and also one of 'Mind', some two or three weeks back, and found them both illuminating—I mean on the present atmosphere of religious and philosophical thinking in England.