Learning cannot be a one-way relationship. Learning by its nature is symbiotic.
Take heed of a newly planted fruit tree. If left dependent only upon the water found in the soil, it will fail to root out and grow fruitfully. It must receive intentional watering and fertilizer to flourish and survive through its first winter.
We as teachers must also be cautious in only being dependent upon the content we find and keep. In quick time this will become stale and dry to those we are called to teach. Co-production of knowledge is the lifeline of great teaching and learning. Students engaged in the process of discovery and inquiry into the content we teach is the cascading of water and the addition of precious fertilizer to the tree of learning.
Surrendering the thought of us as THE teacher is critical in this process. We are only the teacher as much as we are the learner.