“Just as it is better to illuminate than merely to shine, so to pass on what one has contemplated is better than merely to contemplate.”

Source: English Bards and Scotch Reviewers (1809), Line 102.

My Inventions (1919)
Source: My Inventions: The Autobiography of Nikola Tesla
Context: From childhood I was compelled to concentrate attention upon myself. This caused me much suffering, but to my present view, it was a blessing in disguise for it has taught me to appreciate the inestimable value of introspection in the preservation of life, as well as a means of achievement. The pressure of occupation and the incessant stream of impressions pouring into our consciousness through all the gateways of knowledge make modern existence hazardous in many ways. Most persons are so absorbed in the contemplation of the outside world that they are wholly oblivious to what is passing on within themselves. The premature death of millions is primarily traceable to this cause. Even among those who exercise care, it is a common mistake to avoid imaginary, and ignore the real dangers. And what is true of an individual also applies, more or less, to a people as a whole.

Part I, ch. 1.
The Compleat Angler (1653-1655)

The Spiritual Espousals (c. 1340)

Vol. 4, pt. 2, translated by W.P.Dickson.
The History of Rome - Volume 4: Part 2

Dubliners (1914)
Variant: One by one they were all becoming shades. Better pass boldly into that other world, in the full glory of some passion, than fade and wither dismally with age.
Source: "The Dead"

The Trouble With Being Born (1973)

Travels in Alaska http://www.sierraclub.org/john_muir_exhibit/writings/travels_in_alaska/ (1915), chapter 1: Puget Sound and British Columbia
1910s