The final result of our researches has widened the class of substances sensitive to light vibrations, until we can propound the fact of such sensitiv… - Alexander Graham Bell

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.

What this power is I cannot say; all I know is that it exists and it becomes available only when a man is in that state of mind in which he knows exactly what he wants and is fully determined not to quit until he finds it.

I am a believer in unconscious cerebration. The brain is working all the time, though we do not know it. At night it follows up what we think in the daytime. When I have worked a long time on one thing, I make it a point to bring all the facts regarding it together before I retire; I have often been surprised at the results... We are thinking all the time; it is impossible not to think.