Certainties Quote by Isaac Newton

“Let us not make random conjectures about the greatest matters.”

— Heraclitus

We hate the very idea that our own ideas may be mistaken, so we cling dogmatically to our conjectures.

— Karl Popper

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very idle.

— Samuel Johnson

I'm very happy for others to engage in conjecture, but if I was ever conscious of what I'm thinking about when I'm writing, oh…

— Peter Morgan

The entire annals of Observation probably do not elsewhere exhibit so extraordinary a verification of any theoretical conjecture adventured on by the human spirit!

— John Pringle Nichol

You should not put too much trust in any unproved conjecture, even if it has been propounded by a great authority, even if it…

— George Polya

My reasons are the same as for any mathematical conjecture: (1) It is a legitimate mathematical possibility, and (2) I do not know.

— Jack Edmonds

The mind revels in conjecture. Where information is lacking, it will gladly fill in the gaps.

— James Geary

Given a conjecture, the best thing is to prove it. The second best thing is to disprove it. The third best thing is to…

— Saharon Shelah

“Finiteness is not the only example in string theory of a conjecture that is widely believed but so far unproved.”

— Lee Smolin

A felicitous but unproved conjecture may be of much more consequence for mathematics than the proof of many a respectable theorem.

— Atle Selberg

“The popular view that scientists proceed inexorably from well-established fact to well-established fact, never being influenced by any unproved conjecture, is quite mistaken. Provided…

— Andrew Hodges