Newton's great generalization, which he called the "third law of motion," was that "Action and reaction are always equal to each other;"… — Phillips Brooks Copy Share Image
“If something possesses no capacity for activity whatever, it is nothing; it may be wholly penetrated, but it cannot be touched. Therefore… — Wilhelm Von Humboldt Copy Share Image
Action and reaction are equal and opposite, and are expressed simultaneously. Sequentially they are repeated in reverse, the reaction becoming the action… — Walter Russell Copy Share Image
