A Sefer is Your Best Friend

קל"ה - הלכות ראש חודש ז:נה

Chazal says in Pirkei Avos 1:6, "Provide for yourself a rav, and get (kaneh) yourself a friend (chaver)"  It is brought down in different seforim that the word kaneh hints to the pen that one uses to write holy books. Ideally, one should find himself a rav, but if he cannot a way to rectify this is to get (kaneh) oneself a friend.  That is, one should attach (mechaber) holy books to himself and learn them well.  And, by doing this one will know who the true rav is.