Words from
perennial
lasting or existing for a long or apparently infinite time; enduring or continually recurring.
Source: Zen and the Art of Motorcycle Maintenance - Robert M. Pirsig
rebuke
express sharp disapproval or criticism of (someone) because of their behavior or actions.
Source: Zen and the Art of Motorcycle Maintenance - Robert M. Pirsig
oblique
not explicit or direct when addressing a point.
Source: Zen and the Art of Motorcycle Maintenance - Robert M. Pirsig