See also Math and the Bible.
Eternal is descriptive of whatever is infinite and unbounded by time or is outside of time and space, of the state of true existence before time began and continuing after time comes to an end, without beginning, without end, a concept introduced by Jesus. God is usually considered eternal in that He has no beginning and no end. Human souls have a starting point but no end, and they are considered to be eternal as well in Christianity.
|“||Eternity is a very long time, especially toward the end!||”|