From the book Building a Second Brain

Knowledge is the only resource that gets better and more valuable the more it multiplies.

Tiago Forte

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In the episode Leave Home of the podcast The Habit Coach the host phrases hard work in a single line,

Miracles work when we put in the work

Ashdin Doctor

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In the book The 7 Habits of Highly Effective People, the author is talking about product versus production capacity.

If you adopt a pattern of life that focuses on golden eggs and neglects the goose, you will soon be without the asset that produces golden eggs. On the other hand, if you take care of the goose with no aim toward the golden egg, you soon won’t have the wherewithal to feed yourself or the goose

Stephen Covey