A number of years ago I had my secretary transcribe a talk my father had given on dealing with bitterness. I then went through her transcription and edited it for publication (without telling my dad), and we sent it off to the printers. It came back in booklet form in a stack of boxes, and I asked my dad to come by the office. When he did, it was so that I could point to the stack and say, “Look what you wrote.”
Since that time, I think Community Christian Ministries (the ministry my dad is associated with — CCM for short) must have given away hundreds of thousands of copies in its various incarnations.
You can get a copy of the most recent edition here. A number of other essays on matters related to practical Christian living have been added. Trust me — the title essay is a life-changer.