Hi Holobon,
Yes I agree that intention is very important, your book sounds very interesting. I have in the past postponed doing a Reiki session on someone because I have been feeling so angry or upset over something personal and not been confident that I would be mindful enough to keep my own 'issues' under wraps so to speak.
Even now at the start of every Reiki session on another, I always set my intention with a silent mantra that I be a clear Reiki channel and that Reiki flow for the highest good of the person concerned. I often find myself silently repeating the Reiki principles too, I find that helps me to stay focused and mindful :)
Thank you for the important reminder :)
Gentle Blessings
Helen