Alexander Graham Bell — Scottish Inventor born on March 03, 1847, died on August 02, 1922

Alexander Graham Bell was a Scottish-born scientist, inventor, engineer and innovator who is credited with patenting the first practical telephone... (wikipedia)

Before anything else, preparation is the key to success.
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.
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.
Sometimes we stare so long at a door that is closing that we see too late the one that is open.
The most successful men in the end are those whose success is the result of steady accretion.