Before anything else, preparation is the key to success.

By: Alexander Graham Bell 

What this power is, I cannot say. All I know is that it exists...and it becomes available only when you are in that state of mind in which you know EXACTLY what you want...and are fully determined not to quit until you get it.

By: Alexander Graham Bell 

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

By: Alexander Graham Bell