The inventor...looks upon the world and is not contented with things as they are. He wants to improve whatever he sees, he wants to benefit the world… - Alexander Graham Bell

The inventor...looks upon the world and is not contented with things as they are. He wants to improve whatever he sees, he wants to benefit the world; he is haunted by an idea.

When one door closes another door opens; but we so often look so long and so regretfully upon the closed door, that we do not see the ones which open for us.

Don't keep forever on the public road, going only where others have gone. Leave the beaten track occasionally and dive into the woods. You'll be certain to find something you have never seen before.

When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one that has opened for us.