Hi Jed,
I doubted if whatever I see is truth in the world. My perception is clearly influenced by my beliefs. If I believe that I have a wonderful voice and start singing, but I see my voice fluctuations against the original song on a karaoke system , it means that this voice is not as perfect as the voice of the singer in karaoke system - pitch, wavelength and frequency wise.
What I believed as my voice being perfect, is a relative thing and a belief. My perception is not absolute. I could be wrong - these things I see could not be what they are in reality.
Hmmmm..
Is truth a certainity ? Is it a certainity after you have accepted the uncertainty? What is it and what next ?