"He was thinking alone, and seriously racking his brain to find a direction for this single force four times multiplied, with which he did not doubt, as with the lever for which Archimedes sought, they should succeed in moving the world, when some one tapped gently at his door"

In this quote, Alexandre Dumas is describing a male who is deep in thought, attempting to determine how to utilize a single force four times multiplied to move the world. He is influenced by the story of Archimedes, who sought a lever to move the world. The male is so concentrated on his thoughts that he does not discover when somebody taps carefully at his door. This quote is a testimony to the power of idea and the potential of the human mind. It recommends that with sufficient focus and determination, even the most ambitious goals can be accomplished. It also indicates that often, the responses to our questions can come from unexpected sources, such as the individual tapping at the door. Eventually, this quote encourages us to believe deeply and to be open to originalities and perspectives.