Quote by Alexander Graham Bell
"The development of a new method or improved apparatus must be preceded by long development work."
More from Alexander Graham Bell
"When one door closes another opens; but we so often look with regret upon the closed door that we do not see the ones open for us."
"Do not go so far ashore that you cannot return."
"The most successful men in the end are those whose success is the result of steady accretion."
"Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus."