Meaning: The quote "In bodies moved, the motion is received, increased, diminished, or lost, according to the relations of the quantity of matter and velocity; each diversity is uniformity, each change is constancy" by Charles Secondat, also known as Baron de Montesquieu, encapsulates the fundamental principles of physics and philosophy. Charles Secondat, a French philosopher and political thinker of the Enlightenment era, is best known for his influential work "The Spirit of the Laws," in which he discusses the separation of powers and the concept of checks and balances in government. However, this quote delves into a different realm, focusing on the nature of motion, change, and constancy as they relate to the physical world.

The quote reflects an understanding of the laws of motion, which were later formalized by Sir Isaac Newton. It suggests that the behavior of bodies in motion is governed by the interaction of two key factors: the quantity of matter and velocity. These factors determine how motion is received, altered, or dissipated. When a force is applied to an object, its motion is either increased or decreased, depending on the quantity of matter (mass) and the velocity (speed and direction) of the object. This concept aligns with Newton's second law of motion, which states that the acceleration of an object is directly proportional to the force acting on it and inversely proportional to its mass.

The quote also alludes to the idea that diversity and change coexist with uniformity and constancy. This duality suggests that while there is variability and transformation in the physical world, there are also underlying principles and laws that maintain consistency and order. In the context of physics, this can be interpreted as the coexistence of dynamic, ever-changing phenomena with the underlying laws of nature that govern them.

From a philosophical perspective, this quote can be seen as a reflection of the broader concept of change and constancy in human existence. It suggests that diversity and change are inherent aspects of life, but they occur within a framework of uniformity and constancy. This idea aligns with the philosophical notion of Heraclitus, who famously stated that "change is the only constant." Similarly, the quote hints at the interconnectedness of seemingly disparate elements, suggesting that within change and diversity, there is an underlying unity and constancy.

In summary, Charles Secondat's quote delves into the intricate relationship between matter, motion, change, and constancy. It encapsulates fundamental principles of physics and philosophy, hinting at the underlying laws that govern the behavior of bodies in motion, while also touching on broader philosophical concepts of change and constancy in the human experience. This quote serves as a thought-provoking exploration of the interplay between diversity and uniformity, change and constancy, offering insights into both the physical and metaphysical realms.