"A teacher seldom receives full recognition for his services during his lifetime, unless he lives to extreme old age. While the physician is often cheered by the gratitude of those to whom his skill has restored to health, and the clergyman receives the affectionate thanks of those whom he has guided and comforted, and the successful lawyer is supposed to be burdened with plaudits and fees,—the teacher has to do mainly with those who are too immature to understand the services which he renders and to appreciate the self-denial which is manifested in much of his care. His pupils are too little acquainted with the world to compare his acumen and his learning with those of others; they cannot sympathize with him in his ambitions and difficulties and task; they may not feel his strong desire to go on to the acquisition of new knowledge."