The coach spends hours on the field guiding, motivating, training, showing his/her players how to create a winning tactic.
A teacher keeps teaching the learners how to use the knowledge to solve problems, learners need to drill and practice until the minds become creative.
Think about what a farmer, pastor, carpenter, cook, miner, fisherman/woman, driver spend doing everyday. We can sum everything up with these three words:
Hard work. (It does not kill)
Determination. (Nothing is impossible, when you are determined you will find a way through)
Sacrifice. (The time spent working will be returned by the products of hardworking)