A Brief History of Time

by Stephen Hawking

a quantum theory of gravity.

Only light, or other waves that have no intrinsic mass, can move at the speed of light.

We must accept that time is not completely separate from and independent of space, but is combined with it to form an object called space-time.

If we find the answer to that, it would be the ultimate triumph of human reason—for then we would know the mind of God.

“Equations are more important to me, because politics is for the present, but an equation is something for eternity.”