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Bears are made of the same dust as we, and breathe the same winds and drink of the same waters. A bear's days are warmed by the same sun, his dwellings are overdomed by the same blue sky, and his life turns and ebbs with heart-pulsings like ours, and was poured from the same First Fountain. And whether he at last goes to our stingy heaven or no, he has terrestrial immortality. His life not long, not short, knows no beginning, no ending. To him life unstinted, unplanned, is above the accidents of time, and his years, markless and boundless, equal Eternity.
-- John Muir --
from John Muir: In His Own Words
Many have said that only humans are "mortal" for we alone know we have a beginning and an end. Others on this planet are unaware of this and, therefore, have a form of immortality. While this idea is not unique to John Muir, I don't think I've ever heard anyone put it as clearly and concretely as this.