"The great charm and comfort of the system is, that its affects are palpable within a week of trial, which creates a natural stimulus to persevere for few weeks more, when the fact becomes established beyond question"

This quote by William Banting talks to the power of the system he is referring to. He is suggesting that the impacts of the system are felt quickly, within a week of trial, and this produces a natural incentive to continue using it. This is due to the fact that the outcomes become established beyond question after a few weeks of use. Banting is highlighting the great charm and comfort of the system, as it offers tangible results that can be seen and felt in a brief amount of time. This motivates people to keep using the system, as they can see the favorable results it has on their lives. Banting's quote speaks with the power of the system and how it can help people achieve their objectives in a short quantity of time.