“I don’t believe in optimism. I believe in optimal behavior. That’s a different thing.”

Source: A Brief History of Time (1988), Ch. 11
Context: As I shall describe, the prospects for finding such a theory seem to be much better now because we know so much more about the universe. But we must beware of overconfidence - we have had false dawns before! At the beginning of this century, for example, it was thought that everything could be explained in terms of the properties of continuous matter, such as elasticity and heat conduction. The discovery of atomic structure and the uncertainty principle put an emphatic end to that. Then again, in 1928, physicist and Nobel Prize winner Max Born told a group of visitors to Gottingen University, "Physics, as we know it, will be over in six months." His confidence was based on the recent discovery by Dirac of the equation that governed the electron. It was thought that a similar equation would govern the proton, which was the only other particle known at the time, and that would be the end of theoretical physics. However, the discovery of the neutron and of nuclear forces knocked that one on the head too. Having said this, I still believe there are grounds for cautious optimism that we may now be near the end of the search for the ultimate laws of nature.

Don Soderquist “ Live Learn Lead to Make a Difference https://books.google.com/books?id=s0q7mZf9oDkC&lpg=pg=PP1&dq=Don%20Soderquist&pg=PP1#v=onepage&q&f=false, Thomas Nelson, April 2006 p. 49.
On Being Optimistic

From 1980s onwards, Only Integrity is Going to Count (1983)
Context: I find the audiences very excited. But then they come and say to me, "Your optimism has brushed off on me. I didn't know we had an option. I feel so much better." They say, "Your optimism." And I am not optimistic or pessimistic. I feel that optimism and pessimism are very unbalanced. I am a very hard engineer. I am a mechanic. I am a sailor. I am an air pilot. I don't tell people I can get you across the ocean with my ship unless I know what I'm talking about.

As quoted in "Lady with a Switchblade" in LIFE magazine (20 September 1963)

Sofia Boutella: from hung up with Madonna to hanging with Samuel L. Jackson in Kingsman https://www.news.com.au/entertainment/sofia-boutella-from-hung-up-with-madonna-to-hanging-with-samuel-l-jackson-in-kingsman/news-story/9ac4c0ec9799fc4f08fc5b922d339379 (January 30, 2015)

Aleph (2011)