Quotes 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. " Alexander Graham Bell

"When one door closes, another opens: but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us. " Alexander Graham Bell