positiveness

I develop the habit of expressing myself in terms of modest diffidence, never using, when I advanced anything that may possibly be disputed, the words certainly, undoubtedly, or any other that give the air of positiveness to an opinion, but rather say, I conceive or apprehend a thing to be so and so: It appear to me or should not think it, so or so, for such and such reasons; or I imagine it to be so, or it is so, if I am not mistaken. This habit I believe has been of great advantage to me when I have had occasion to inculcate my opinion and persuade men into measures that I have been, time to time, engaged in promoting.