What did desecrates Plato and Airstotle want to find out?

Descartes sought to find a method for acquiring knowledge that was certain and indubitable, leading to his famous statement "I think, therefore I am." Plato was interested in understanding the nature of reality and the concept of ideal forms, believing that true knowledge could be found through reason and contemplation. Aristotle sought to systematically study and understand the natural world, developing methods of logic and classification that laid the foundation for modern scientific inquiry.