Hi Jeff,
A vow is a very special and unique type of focused intent. While a vow may have sacred or consecrated elements to it, in the case of classic Buddhist texts and doctrine, these often remain elusive, mysterious, nebulous (or too complex for simple minds
). As opposed to being clear and specific.
Clear, specific and easy to grasp is what I'm aiming for and what was meant by focused intent. So while I heartily endorse any and all earnest efforts to interface with the Divine, for myself I choose to employ guidance and/or methods which can be easily understood. (As would most of us, I think)
The
sustaining power of the Buddhas (or one's
divine consciousness of choice) would perhaps be reflected in the sustaining power of one's commitment. I would call this bhakti, the 2-way transmission, flow and exchange of spiritual energies. Love and devotion. For me, this is a vital ingredient of endeavors to realize and/or build the rainbow body.
A vow is for the duration. A commitment is for the duration. All vows are commitments. But not all commitments are vows.
Focused intent need engage neither commitment nor vow. Focused intent, imo, is merely being very clear and precise about the use of one's energy in achieving one's purpose or goal. Or the desires of one's heart. I believe that bhakti, or passion in one's heart and soul, must be harnessed and utilized in order to facilitate the type of endeavors being contemplated in this thread.