The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.

P- To those who have known comfort, discomfort is a real torture.
Q- Comfort is now one of the causes of its own spread.
R- The more comfort is brought into the world, the more it is likely to be valued.
S- It has now become a physical habit, a fashion, an ideal to be pursued for its own sake.