- A universal error.
- A relation between one illusion (the outer world) and another (the inner world).
- A prejudice raised to an axiom.
- Something that a few will die for.
- That which serves us best in expressing our lives. (A rotting log is truth to a bed of violets; while sand is truth to a cactus.)
- Anything which happened, might have happened, or which will possibly happen.
- The opinion that still survives.
- An imaginary line dividing error into two parts.