"The love of all-inclusiveness is as dangerous in philosophy as in art"

This quote by George Santayana is a caution versus the risks of overgeneralization. He is recommending that when it comes to viewpoint and art, it is necessary to be specific and to avoid making sweeping statements that are too broad. He is cautioning against the tendency to attempt to include whatever in one's philosophy or art, as this can result in an absence of focus and clearness. He is recommending that it is better to be accurate and to concentrate on the information, rather than trying to incorporate too much in one's work. By doing so, one can develop a more meaningful and effective viewpoint or art.