The search for truth.

Why is the human being in search for the truth? Because, his perceptions differ at different times. I may see the color blue, but I can also see the color red, in different circumstances. Sometimes, I want to know, exactly what I am perceiving, or what I have perceived in the past. This is because, I want to know, whether all my perceptions cannot be misplaced by my mind. How is the truth important? If I see what is normally blue, and my mind identifies it as red, then I have seen red, instead of what is blue. So, in this case, the truth is neither blue, nor red. The truth is not blue, because I have perceived it as red, and the truth is not red, because the actual color is blue. Now in the given scenario, if I am desperately in search of the truth, then is it possible for me to comprehend the truth? If not, then how is truth important? What is the truth? Is the truth how exactly I see a given circumstance? My mind may not be aware in the given circumstance. Then do I depend on what I have not seen in the circumstance, so that I see the circumstance better?
Let us be specific. There is a concept called truth. Now the concept cannot be based entirely on perception, through the physical senses. Then, what can the concept of truth be based upon? My belief? What is belief based upon? Is the search for truth through the senses futile? How does one exist with the senses? Is this an important question?