Sentence:  ...for that it chiefly, and in a manner only requireth of us a rational and spiritual service, consisting in performance of substantial duties, plainly necessary or profitable; not withdrawing us from the practice of solid piety and virtue by obligations to a tedious observance of many external rites; not spending the vigour of our minds upon superficial formalities, (or <WSD>negotious</WSD> scrupulosities, as Tertullian termeth them,) such as serve only to amuse childish fancies, or to depress slavish spirits. 
Meaning of the word marked with <WSD> tags:  Requiring meticulous attention to detail.