The philosophy that believes in the importance of timeless ideas and universal truths is:

Perennialism is an educational philosophy centered on the belief in timeless ideas and universal truths, advocating for the study of classic works to cultivate intellectual and moral development. It emphasizes enduring principles over transient trends.

• Essentialism focuses on a common core curriculum of basic skills and knowledge deemed essential for all students, rather than universal truths.
• Progressivism prioritizes student-centered learning, experience, and adapting to societal change, contrasting with Perennialism's fixed truths.
• Reconstructionism aims to use education as a tool for social reform and addressing societal problems, a distinct goal from preserving timeless wisdom.