“Farsighted theologians are now working to mine the eternal metal from the teachings of Jesus and to forge it for all time.”

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 102.

The Knowledge of God and the Service of God (1939)

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 399.

The Second Coming of Christ: The Resurrection of the Christ Within You, (2004) by Yogananda

Source: Productive thinking, 1945, p. 1

Source: Paula Spencer

Episode 2, Chapter 13-14
The Power of Myth (1988)
Context: Campbell: Eternity isn't some later time. Eternity isn't a long time. Eternity has nothing to do with time. Eternity is that dimension of here and now which thinking and time cuts out. This is it. And if you don't get it here, you won't get it anywhere. And the experience of eternity right here and now is the function of life. There's a wonderful formula that the Buddhists have for the Bodhisattva, the one whose being (sattva) is illumination (bodhi), who realizes his identity with eternity and at the same time his participation in time. And the attitude is not to withdraw from the world when you realize how horrible it is, but to realize that this horror is simply the foreground of a wonder and to come back and participate in it. "All life is sorrowful" is the first Buddhist saying, and it is. It wouldn't be life if there were not temporality involved which is sorrow. Loss, loss, loss.
Moyers: That's a pessimistic note.
Campbell: Well, you have to say yes to it, you have to say it's great this way. It's the way God intended it.

Source: Something More, A Consideration of the Vast, Undeveloped Resources of Life (1920), p. 43

Preface.
A History of Science Vol.2 Hellenistic Science and Culture in the Last Three Centuries B.C. (1959)