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

Don't keep forever on the public road. Leave the beaten path occasionally and dive into the woods. You will be certain to find something you have never seen before, and something worth thinking about to occupy your mind. All really big discoveries are the result of thought.

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.

You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them.