To be without desire is to be content. But contentment is not happiness. And in contentment there is no progress.
Happiness is to desire something, to work for it, and to obtain at least a part of it.
In the pursuit of beloved labour the busy days pass cheerfully employed, and the still nights in peaceful sleep. For labour born of desire is not drudgery, but manly play. Success brings hope, hope inspires fresh desire, and desire gives zest and life and joy to labour. This is true whether your days be spent in the palaces of the powerful or in some little green by-way of the world. Therefore, while yet you have the strength, cherish a desire to do some useful work in your little corner of the world, and have the steadfastness to labour.