Dmitri Mendeleev

There is nothing in this world that I fear to say.

The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.

There exists everywhere a medium in things, determined by equilibrium.

America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves.

Nothing that is worth doing can be achieved in a lifetime; therefore we must be saved by hope.