Practically the whole teaching of the Buddha, to which he devoted himself during 45 years, deals in some way or other with this path. He explained it in different ways and in different words to different people, according to the stage of their development and their capacity to understand and follow him. But the essence of those many thousand discourses scattered in the Buddhist scriptures is found in the noble eightfold path.
It should not be thought that the eight categories or divisions of the path should be followed and practiced one after the other in the numerical order as given in the usual list above. But they are to be developed more or less simultaneously, as far as possible according to the capacity of each individual. They are all linked together and each helps the cultivation of the others.From Tricycle