WHY ARE SOME SO CERTAIN OF THEMSELVES, BUT WISER PEOPLE ARE FULL OF DOUBTS?

This is indeed an interesting question. We see it all the time around the people that we associate with. We see those people who fly through life seemingly without question or worry. We also see those who question everything, curios about things that they don't understand. But which one of the two actually knows the truth. Do the ones who fly through life know something that the others don't? Or do they believe that worrying about things that they don't understand is a waste of time. They rather pretend that they know everything there is to know and save themselves the torment. Some people believe that they should just enjoy life and leave the complicated questions to be answered by fate, or God. Others believe that to answer these questions makes this life worthwhile.

One has to ask, if the pursuit of truth is a waste of time, an idea that cannot be achieved, or that the truth is real and can be found by us in this life. There are only two ways to look at this. One that it is possible to know the truth and that would make the pursuit worthwhile for the wise people of the world. Secondly truth is abstract, left to interpretation and cannot stand for any one concept or thing. Therefore it is useless to worry about truth and one should live their lives free of such thought and do as they wish.

If I were to conclude the latter of the two then I would be looking over my shoulder every second of the day. It is because the wiser of the two sets of people have chosen to pursue the truth we have things in our society to keep us safe and sound and be able to distinguish between right and wrong. The pursuit of truth is very real and therefore possible to know. It is there in the experience of "NOW". Right now, at this very moment you are experiencing truth. The problem occurs when we try and put truth into words and distort its meaning. Truly knowing the truth precludes talking about it using language. However if you must talk about it "truthfully" then at least know that when you talk it through, it will be distorted. As for answering the question of why some are so certain of themselves, while the wiser people doubt, the answer is simple.

To be wise you have to acknowledge that there is always something to learn.
To be wise you have to see all possibilities while accepting the fact that there maybe more.
The absolutely convinced individual can only see one way, his or her own way.