engaged teaching is relevant to aspiring, new, and veteran educators, much as a forest needs healthy, growing seedlings, saplings, young, and mature trees.
I love the analogy of a healthy education "forest" being dependent on the diversity of the "vegetation" or the people growing there. I often think of the diversity in schools as ethnic diversity but diversity of experience is also critical. There is continuity, stability, and comfort provided by the experienced teacher whereas the sapling teachers bring in new ideas, fresh energy, and boundless hope.