Truth

Truth is unalterable, eternal and unambiguous. It can be unrecognized, but it cannot be changed. It has no opposite: no beginning and no end. It merely is. The world of perception, on the other hand, is the world of time, of change, of beginnings and endings. It is based on interpretation, not on facts. It is the world of birth and death. It is learned rather than given, selective in its perceptual emphasis, unstable in its functioning and inaccurate in its interpretations.
- From A Course in Miracles