Some Cayce quotes to get you started:
Know that all strength, all healing of every nature is the changing of the vibrations from within, - the attuning of the divine within the living tissue of a body to Creative Energies. This alone is healing. Whether it is accomplished by the use of drugs, the knife or what not, it is the attuning of the atomic structure of the living cellular force to its spiritual heritage. (1967-1)
Healing for the physical body, then, must be first the correct choice of the spiritual import held as the ideal of the individual. For it is returning, of course, to the First Cause, First Principles. (2528-2)
... for there is good in ALL methods - and they have their place. But from whence comes the healing? Whether there is administered a drug, a correcting or an adjustment of a subluxation, or the alleviating of a strain upon the muscles, or the revivifying through electrical forces; they are ONE, and the healing comes from WITHIN. Not by the method does the healing come, though the consciousness of the individual IS such that this or that method IS the one that is more effective in the individual case in arousing the forces from within. But METHODS are NOT ideals. The IDEAL must be kept in the proper SOURCE ... (969-1)
Prayer is just as scientific as the knife, in its individual field. Mechano-therapy or mechanical treatments are as effective in their individual field, and are of the same source as prayer – if applied in the same way or manner, or with the same sincerity. (1546-1)
... as the body may dedicate its life and its abilities to a definite service, to the Creative Forces, or God, there will be healing forces brought to the body. This requires, then, that the mental attitude be such as to not only proclaim or announce a belief in the divine, and to promise to dedicate self to same, but the entity must consistently live such. (3121-1)
Remember, healing – all healing comes from within. Yet there is the healing of the physical, there is the healing of the mental, there is the correct direction from the spirit. Coordinate these and you'll be whole! But to attempt to do a physical healing through the mental conditions is the misdirection of the spirit that prompts same ... But when the law is coordinated, in spirit, in mind, in body, the entity is capable of fulfilling the purpose for which it enters a material or physical experience. (2528-2)
"Fear not, I am with thee." This should be upon the mind, the heart; that there may be the renewing of the life-flow in the blood of the body, that the organs thereof may be attuned to the spirituality . . . (1089-2)
For, what is the source of all healing for human ills? From whence doth the body receive life, light, or immortality? ... the body as an active force is the result of spirit and mind ... Each soul has within its power that to use which may make it at one with Creative Forces or God. These are the sources from which life, light, and the activity of body, mind and soul may manifest in whatever may be the active source or principle in the mind of the individual entity... (3492-1)
Change the body thoughts – we will change the effect upon those activities in the throat, in the eyes, in the ears, and the body forces... Remember the law – and the law of the Lord is perfect, in body, in mind, in spirit. And as laws of the physical, of the mental, of the spiritual are kept in unison of purpose, a more perfect balance is kept in the body. (3246-2)
Because others have neglected or do neglect or mistreat or take advantage, know that if ye rail on them ye are creating poison within thine own system. But if ye do not rail on them, it turns upon THEM! But BLESS them, rather. (1311-1)
Do not let anxieties become stumblingblocks in thy dealings with others. Do not let the physical conditions become an excuse as to thy feelings and thy relationships to others. Rather let them be met as one. (1317-1)
Yet, when one is in ANY environ, one is subject to the laws of same; and unless material laws are spiritualized in the mental activity of souls, those oft that are healed physically remain sick spiritually. (559-7)