Teaching is a job that comes from within.
You need that inner vision, energy, and enthusiasm to do the job well.
It really helps if the community around you boosts that drive with shared goals, encouragement, appreciation, and collaboration. That's ideal.
Sometimes, however, that's not available and you have to reach down inside yourself to energize, encourage, and cheer yourself on to do a good job--a job for which the rewards are often difficult to see or calculate, a job quite similar to parenting.