Instructive

Definition: (1) conveying knowledge; serving to educate or inform <often suggests methodical or formal teaching>; (2) to edify <improve someone morally or intellectually>

Quotes:
• Kids need time for problem solving, critical thinking, applying knowledge through project-based instruction, working in teams, falling down and getting right back up to figure out what they didn’t understand and why. — Randi Weingarten (1984-) American teacher & lawyer
• We all agree that it’s fit to be as happy as we can, and we need no instructor to teach us this knowledge, ’tis born with us, and is inseparable from our Being, but we very much need to be informed what is the true way to happiness. — Mary Astell (1666–1731) English philosopher

Comment: Teachers are some of our most valuable citizens.