Great discoveries and improvements invariably involve the cooperation of many minds. I may be given credit for having blazed the trail, but when I look at the subsequent developments I feel the credit is due to others rather than to myself.

There cannot be mental atrophy in any person who continues to observe, to remember what he observes, and to seek answers for his unceasing hows and whys about things.

Observe, Remember, Compare.

Leave the beaten track behind occasionally and dive into the woods. Every time you do you will be certain to find something you have never seen before.

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.

Man is an animal which, alone among the animals, refuses to be satisfied by the fulfillment of animal desires.

One day there will be a telephone in every major city in the USA