“When you've exhausted all possibilities, remember this: You Haven't!”

— Thomas Edison

Not located in Edison's writings, but found in Robert H. Schuller's self-help book Tough Times Never Last, But Tough People Do! from 1983 https://books.google.com/books?id=8oTOa4n3k4oC&pg=PA28&dq=%22exhausted+all+possibilities%22+remember&hl=en&sa=X&ved=0ahUKEwiL88bb6-vKAhVD-mMKHVzNDVEQ6AEIHTAA#v=onepage&q=%22exhausted%20all%20possibilities%20remember%20this%22&f=false. <br class="br">Disputed

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Thomas Edison57

American inventor and businessman 1847–1931

Jean Kerr book Please Don't Eat the Daisies

"Introduction"
Please Don't Eat the Daisies (1957)

“The days when you are exhausted and on the brink of quitting, remember why you started. Think about all those people that are relying on you. You may be an inspiration for a lot of people without knowing it.”

Yusof Mutahar (1990) Australian doctor and actor

Book name: ECG simplified by Dr Yusof Mutahar

“When men feel that they have exhausted all their own resources and have come to an end of all their own innate possibilities and that the problems and conditions confronting them are beyond their solving or handling, they are apt to look for a divine Intermediary…”

Alice A. Bailey (1880–1949) esoteric, theosophist, writer

Source: The Reappearance of the Christ (1948), Chapter I: The Doctrine of the Coming One (Western Teaching), The Doctrine of Avatars (Eastern Teaching)

“I would define the baroque as that style that deliberately exhausts (or tries to exhaust) its own possibilities, and that borders on self-caricature.”

Jorge Luis Borges book A Universal History of Infamy

A Universal History of Iniquity, preface to the 1954 edition; tr. Andrew Hurley, Collected Fictions (1998)
Context: I would define the baroque as that style that deliberately exhausts (or tries to exhaust) its own possibilities, and that borders on self-caricature. [... ] The baroque is the final stage in all art, when art flaunts and squanders its resources.