As14 has often been mentioned before, every activity in Chinuch should be carried out with particular enthusiasm, in as much as it is like planting a seed, or taking care of a seedling, where every additional effort, however small, will eventually be translated into extraordinary benefits when the said seed or seedling becomes a mature fruit-bearing tree. The same is true of the care taken to shield the seed or seedling from harmful effects.
By the same token, it will be realized that, although Mitzvos and good deeds should be done without thought for reward, nevertheless the reward for every activity in Chinuch is greater than the reward for any other Mitzvah, in as much as the effects are lasting and cumulative from generation to generation.
14 Letters from the Rebbe vol. 2, p.88.
Shared with permission from Anash Chinuch, from the book Teachings of the Rebbe on Chinuch.