There is no impossibility, only unwillingness.

The creation of a thousand forests is in one acorn.

The only impossible journey is the one you never begin.

Do not think that what is hard for you to master is humanly impossible; but if a thing is humanly possible, consider it to be within your reach.

It's the possibility of having a dream come true that makes life interesting.

Man is a universe in little.

Free will, though it makes evil possible, is also the only thing that makes possible any love or good or joy worth having.