Im never an absolute person, that is why I can never give a definite answer, even if sometimes, Im sure of it.
Which is why I always use "I think" to open a sentence or end my sentence. Thats what I discovered when im browsing through my blog while working. Haha!
Based on my own understanding for MYSELF, using "I think" makes me slightly comfortable than using positive term. At least its my own opinion and if anything I said is not factual, but well...its still MY opinion. And since its MY opinion, it can be subjective. But as a Libra, i often try to give objective opinions, I think... Haha!