Which philosophical entities did William of Ockham try to eliminate using Occam’s razor?

William of Ockham, a prominent Scholastic philosopher, employed the principle of economy known as Ockham’s razor—which states that "plurality should not be posited without necessity"—to simplify philosophical explanations by eliminating various entities that he deemed redundant.12

Specifically, Ockham used this principle to dispense with the following:

• Relations: He argued that relations are not distinct entities but are instead nothing more than their foundation in actual things.1
• Efficient causality: He tended to view causality as a regular succession of events rather than a separate, underlying force.1
• Motion: He characterized motion simply as the reappearance of an object in a different location, rather than a distinct process or entity.1
• Psychological powers: He rejected the idea of distinct psychological powers for each mode of sensation.1
• Divine ideas: He argued that the ideas present in the mind of the Creator are not separate models of creation but are merely the creatures themselves.1