Sentence:  But ſurely no Man whatſoever ought in Justice or good Manners to be charged with Principles he actually diſowns, unleſs his Practices do openly and without the leaſt Room for Doubt, contradict his Profeſſion: Not upon ſmall <WSD>Surmiſes</WSD>, or becauſe he has the Miſfortune to have Ill Men ſometimes agree with him in a few general Sentiments. 
Meaning of the word marked with <WSD> tags:  Thought, imagination, or conjecture, which may be based upon feeble or scanty evidence; suspicion; guess.