A teacher is someone who always wishes his/her 'Children' to become something greater than him/her. In any professions recognition is considered as having award, social importance or financial achievements except in teaching profession. In teaching profession recognition or achievement of a teacher doesn't lies on those 'Materialistic' outcomes or fascinations, rather the recognition from the students always defines the success or happiness of a teacher.
In other words, The Secret To Happiness Is Being A Teacher, because It's a privilege to become a teacher. And the one and only thing in the whole universe that can make a teacher happy is the recognition from their 'Children' or students. That is the reason why teaching is considered as the Noble Profession.