A powerful agent is the right word. Whenever we come upon one of those intensely right words in a book or newspaper the resulting effect is physical as well as spiritual, and electrically prompt.
When there was room on the ledge outside of the pots and boxes for a cat, the cat was there- in sunny weather- stretched at full length, asleep and blissful, with her furry belly to the sun and a paw curved over her nose.
Training- training is everything; training is all there is to a person. We speak of nature; it is folly; there is no such thing as nature; what we call by that misleading name is merely heredity and training. We have no thoughts of our own, no opinions of our own; they are transmitted to us, trained into us.