The world is a farm for the next; what is sown here is reaped there
This hadith supplies the logical hinge of Ghazali's entire ethical system, converting ordinary daily conduct into an investment whose return is only visible in a different life.
Al-Ghazali cites the hadith describing the world as a farm for the hereafter in the closing books of the Ihya Ulum al-Din to frame the whole preceding structure of the work, its detailed guidance on worship, transactions, character, and destructive traits, as instrumental rather than complete in itself. The agricultural image is precise: a farm produces nothing by being admired, only by what is planted and tended in it, and Ghazali applies that logic directly to worldly life, treating each act, however small, as a seed whose harvest is reaped in the next life rather than this one. This framing unifies the Ihya's four quarters, on worship, social conduct, destructive traits, and saving traits, under a single rationale: none of the detailed rules make sense as ends in themselves, only as cultivation toward an outcome beyond the visible present. It also supplies a built-in argument against treating worldly success as the measure of a life well lived, since a farm's value was never in the field itself but in what eventually comes out of it.
The world is a farm for the next; what is sown here is reaped there.
Ghazali structured the entire four-quarter Ihya around this instrumental relationship between worldly conduct and its otherworldly consequence.
Ihya Ulum al-Din