Verbatim references:

None
Et sic de similibus references:

Spiritual zeal is not the same as youthful vigor; spiritual zeal propagates the Kingdom of Heaven, but youthful vigor only propagates the human species.
(Scripture references under construction)

Spiritual zeal is born of the love of God; it does not and will not diminish with age, instead it will continue to grow stronger.
(Scripture references under construction)

Youthful vigor is born of the lust of the flesh i.e. personal ambitions and sexual desires and will only diminish with age.
(Scripture references under construction)

Holy men of the ancient times did not write what we now call holy scriptures until they were exceedingly old men.
(Scripture references under construction)

John, the Apostle, wrote his Gospel, the Book of the Revelations and his letters when he was nearly a hundred years old.
(Scripture references under construction)

Moses wrote his five books when he was nearly one hundred and twenty.
(Scripture references under construction)