What do you believe is true, but cannot prove?

I believe but cannot prove, that the Inertia of an object results from the resistance by space-time to asymmetrical distortions of the gravitational field. One implication of this is that space-time would have an inherent "elastic" quality to it.

Another interesting list: http://www.edge.org/responses/what-is-your-favorite-deep-elegant-or-beautiful-explanation

You may get people trying to bullsh*t you that they don't believe anything without evidence or that they "don't do belief." Don't you listen to that. There are things we may believe which cannot be proven, but about which we don't care that it can't be proven. Then there are things which we believe for what we consider to be good reason, but which are entirely subjective in nature.

I believe that Hayley Westenra is a natural talent of a kind which only comes along once in a great while, perhaps a thousand years. She has just celebrated her 26th birthday a week ago. She sang this when she was 15 years old:

I sincerely believe, but cannot prove, that Vegemite comes direct from the devil's bottom after a heavy night on the ale.

I believe ! ! !

I believe, but cannot prove, that a light ray transcends time. Meaning that if one was riding on a light ray, there would be no time.

She sings beautifully.

On Scientific progress, some might say there is no such thing as progress because for every benefit there is 'at least' one drawback and future hindsight alone will show how many and how damaging those drawbacks are.... alas too late!

That the USA is harmed far more by the 'right to keep and bear arms' in the form of assault rifles than the protection afforded by them... It makes those who lobby for them seem uncivilized and in the eyes of the world it makes the USA less civilized because of it.

I believe but cannot prove that quarks and Higg's bosons are fake things that were imagined to gain access to noble prize monies.

I don't believe you...

That mistakenly could be instantiated as a principle of conservation of complexity...
One has to wonder what would be done of the 2 law of thermodynamics which says the opposite...
Perhaps it is the case that civilization although progressing stumps upon more problems then those it can resolve and there, you have the explanation on why it seams as if we don't really progress or even recede all the while also increasing our explanatory power by comparison with the past...

I believe but cannot prove that "love is blind."

If you reason that smell can see, then perhaps not...

Meditation give rise to insights that can change a life for the better but most aren't interested, don't believe in it and don't care to try it out. A life without meditation is like...

... there's no point in saying any more.

Some of the people giving you responses here are just selling their particular brand of anger and lack of self-control. Laugh at them...they are funny people.

Anyhow...I do not do "believing."

I make some guesses from time to time...but the reason I am making guesses is that I cannot prove whatever it is that I am guessing about. If I could prove it, I wouldn't need to be guessing.

And when I am guessing...I call it a guess rather than try to disguise the fact that I am guessing by calling my guessing...believing.

By the way...if anyone tells you that people who do not do believing are bullshitting you, don't listen to them. They are trying to bullshit you.

No bullshit ?...

Lets be honest Frank I am sure you know belief drives action...what would be the purpose of getting up in the morning if you didn't believe without certainty that life will keep being worthwhile...