Some parts of a sentence have been jumbled up and labelled P, Q, R and S. Select the option that gives the correct sequence in which these parts can be rearranged to form a meaningful and grammatically correct sentence.

His work is always vigorous,

P. to weigh the evidence or to

Q. take a comprehensive view

R. of a partisan who never pauses

S. but he imputes motives in the spirit of the situation.