My approach to massage is one of more natural principles; looking at the dog as a whole. (caringcaninemassage.com)
In other words you use natural principles, but optimize them for human uses. (realclimate.org)
The five - to - one ratio is so fundamental it is the first of 45 «natural principles of love» that Gottman sets forth in his newest work, Principia Amoris, a book he calls his magnum opus. (psychologytoday.com)