Assumptions Sayings and Quotes

Below you will find our collection of inspirational, wise, and humorous old assumptions quotes, assumptions sayings, and assumptions proverbs, collected over the years from a variety of sources.

We all make basic assumptions about things in life, but sometimes those assumptions are wrong. We must never trust in what we assume, only in what we know.     

Darren Shan

Positive assumptions are needed only when you have negative assumptions that you're trying to overcome. But when you drop your assumptions altogether, your soul stands naked in the open fields of possibility. And what you choose to create from that space is up to you.     

T.K. Coleman

The assumption that humans could be a reliable back up for the system was a fallacy!     

Astro Teller

Assumptions are unopened windows that foolish birds fly into, and their broken bodies are evidence gathered too late.     

Bryan Davis

The assumption that things which have been conjured in the past will always be conjured in the guiding principle not of rational but of animal behavior.     

C. S. Lewis

But you are making assumptions without all the facts, and that's not a sign of intelligence.     

C.C. Hunter

If we worked on the assumption that what is accepted as true really is true, then there would be little hope for advance.     

Orville Wright

We make the assumption that everyone sees life the way we do.     

Miguel Angel Ruiz

An assumption is something that is generally accepted as being true.     


Assumptions are made and most assumptions are wrong.     

Albert Einstein

When we believe in lies, we cannot see the truth, so we make thousands of assumptions and we take them as truth. One of the biggest assumptions we make is that the lies we believe are the truth!     

Miguel Angel Ruiz

The hardest assumption to challenge is the one you don't even know you are making.     

Douglas Adams

The assumption that men were created equal, with an equal ability to make an effort and win an earthly reward, although denied every day by experience, is maintained every day by our folklore and our daydreams.     

Margaret Mead

We make all sorts of assumptions because we don't have the courage to ask questions.     

Miguel Angel Ruiz

New ideas can be supremely bad ideas, and by the time people realize how bad they are, it is sometimes difficult to get rid of them.     

Alister E. McGrath

Assumptions are quick exits for lazy minds that like to graze out in the fields without bother.     

Suzy Kassem

The assumption of perfect knowledge is very far from reality a lot of the evil in the world is actually not intentional.     

George Soros

Assumptions allow the best in life to pass you by.     

John Sales

Assumptions are dangerous things to make, and like all dangerous things to make, bombs, for instance, or strawberry shortcake, if you make even the tiniest mistake you can find yourself in terrible trouble.     

Daniel Handler

It is useless to attempt to reason a man out of a thing he was never reasoned into.     

Jonathan Swift

We all make assumptions every day. Some more important than others. Some more damaging than others. And things, very often, are not at all what they seem.     

B.B. Shepherd

The assumption must be that those who can see value only in tradition, or versions of it, deny man's ability to adapt to changing circumstances.     

Stephen Bayley

Fixing is the illness model; acceptance is the identity model; which way any family goes reflects their assumptions and resources.     

Andrew Solomon

Start with the assumption that the best way to do something is not the way it's being done right now.     

Aaron Levie

Most of our assumptions have outlived their uselessness.     

Marshall McLuhan

Incorrect assumptions lie at the root of every failure. Have the courage to test your assumptions.     

Brian Tracy

If you start a conversation with the assumption that you are right or that you must win, obviously it is difficult to talk.     

Wendell Berry

Most of us make assumptions about how someone will relate to us, and they are often unfounded.     

Michele Jennae

Assumptions are what we don't know we are making.     

Douglas Adams

The assumption that seeing is believing makes us susceptible to visual deceptions.     

Kathleen Hall Jamieson

The assumption of an absolute determinism is the essential foundation of every scientific enquiry.     

Max Planck

Never make assumptions about someone based on your past experiences with someone else.     


Begin challenging your own assumptions. Your assumptions are your windows on the world. Scrub them off every once in while, or the light won't come in.     

Alan Alda

If the assumptions used in calculating energy are changed, then this seriously affects the final result, even though the same body of data might be used.     

Charles Francis Richter

A theory's assumptions always are and ought to be unrealistic. Further, we should attempt to make them more unrealistic in order to increase a theory's fruitfulness.     

Satoshi Kanazawa

The problem with making assumptions is that we believe they are the truth. We could swear they are real.     

Miguel Ruiz

The assumption that what currently exists must necessarily exist is the acid that corrodes all visionary thinking.     

Murray Bookchin

Assumptions are usually presumptuous but often correct.     

Walter Darby Bannard