The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options.

P: One has to work hard to establish, develop and maintain deep and lasting bonds with those who matter in one’s life.

Q: As "Man is not an island entire of itself", he cannot be happy in isolation.

R: Humans live out their life in the company of their family, friends, colleagues, superiors, even total strangers in buses and lifts.

S: And, brick by brick, they must build their relationship with each one, to lay a secure foundation for their road to happiness.