Matthew Arnold believed that for a poem to be of high quality, it must possess both "higher truth" and "higher seriousness." He did not fully define "high seriousness" but suggested it referred to an extreme level of seriousness in applying ideas to life. Arnold viewed poetry as having a high, moral purpose of interpreting life, and he judged poets based on whether their works achieved this high standard of truth and seriousness. While he praised poets like Milton, Shakespeare, and Homer as "classics," he believed Geoffrey Chaucer lacked the necessary high seriousness to be considered on their level, though he still recognized Chaucer's enduring popularity and power.