Russell's adolescence was very lonely, and he often contemplated suicide. He remarked in his autobiography that his keenest interests were in "nature and books and (later) mathematics saved me from complete despondency;" only his wish to know more mathematics kept him from suicide. He was educated at home by a series of tutors. When Russell was eleven years old, his brother Frank introduced him to the work of Euclid, which he described in his autobiography as "one of the great events of my life, as dazzling as first love."