Aristotle's early philosophical contributions included significant accomplishments in logic, metaphysics, and natural sciences. His development of the Syllogism laid the groundwork for formal reasoning and critical thinking, which remains influential in contemporary logic. Aristotle’s exploration of causality and the principles of change and substance shaped philosophical discourse for centuries. Additionally, his observations in biology and the classification of living organisms displayed a systematic approach to understanding natural phenomena. Aristotle's holistic perspective established the foundations of various fields, making him a pivotal figure in the evolution of Western philosophy and science.