I am an odd number. Take away one letter and I become even. What am I?

Forward I am more than heavy, but backward I am not.

First is the first of first, last is the last of last, the other two are between you!

I speak to end, yet end to speak, I’m strongest when my truth is weak. I bind the wise, confuse the sane, I’m freedom’s lock and logic’s chain. I live in questions, die in proof What am I, that undoes truth??

I am not, yet all becomes through me. I end before I start, and start where none remain. I speak in circles older than sound, and hide the birth of light within my death.