To compel him to spend the greater part of his school-life in doing what was distasteful to him, would be the worst possible preparation for them.
For, to begin with, the sense of duty is not the highest motive to action.

A far higher motive is love.

If the sense of duty to God, for example, had not devotion to God and love of God behind it, the object of one's worship would be a malignant rather than a beneficent deity, a devil rather than a God.

Or let us take the case of a child who is dangerously ill, and who needs to be carefully and even devotedly nursed.

By whom will he be the more effectively nursed,--by his mother who loves him passionately, or by a hired nurse who cannot be expected to love him but who has a strong sense of duty to her employers?
(I am assuming that as regards professional skill, and the sense of duty to God, the two women are on a level.) Surely the mother, sustained by love in the endurance of sleeplessness and fatigue, and in the exercise of that unceasing vigilance which lets no symptom escape it, will be the better nurse.