If you buy only one more book this year make sure it is this one - from Skylight Press.
Letters from old magus W.G.Gray to the young enquirer Alan Richardson back in 1969/70.
If you want a second opinion go see Peregrin Wildoak's review of it on his blog site https://magicoftheordinary.wordpress.com
Words of wisdom for anyone beginning on the occult path - and well worth thinking about for anyone further along the way.