Don't keep forever on the public road, going only where others have gone. - Alexander Graham Bell

En ocasiones nos quedamos tanto rato mirando fijamente la puerta que se cierra, que solo vemos demasiado tarde la que se abre.

Leave the beaten track occasionally and dive into the woods. Every time you do so you will be certain to see something you have never seen before. Of course it will be a little thing, but do not ignore it. Follow it up, explore around it, and before you know it, something worth thinking about to occupy your mind.

I begin my work at about nine or ten o'clock in the evening and continue until four or five in the morning. Night is a more quiet time to work. It aids thought.