This quote discusses the idea that God, who has given animals the ability to move in ways we cannot fully comprehend, is also capable of instilling other forms of motion in the world that may escape our understanding. Newton suggests that while some might view these principles as spiritual, he believes it may also be possible to see them as mechanical. He chooses not to delve deeper into the mechanical aspect, indicating a preference for the spiritual interpretation. This reflects a mindset that acknowledges the limits of human understanding while embracing the potential for greater truths. The quote encourages us to remain open to possibilities beyond our current knowledge, fostering a sense of freedom in our exploration of existence. Ultimately, it reminds us that there are layers to reality that may still await our discovery.