«وَكُلُّ مَنْ يَطْلُبُ عِنْدِي جَنًى / فَمَا لَهُ إِلَّا جَنَى غَرْسِهِ»
Anyone who seeks fruit from me receives only the fruit of what he himself planted.
Janā is a harvest or fruit; ghars is the act or product of planting. Conduct within a relationship is pictured as sowing, and its response as reaping. The metaphor connects action to consequence through a tangible image.
The restriction mā ... illā limits the expected return to what one planted. In context it voices a speaker’s principle of reciprocity, not a universal mathematical claim about every human outcome.
Rhetorical structure: sowing = prior conduct; fruit = response; restriction = the declared limit.