غَرَسَ الْمُعَلِّمُ الْعِلْمَ، ثُمَّ أَغْلَقَ مِفْتَاحَهُ فَأَثْمَرَ.
The teacher planted knowledge, then shut its key, and it bore fruit.
Planting and fruiting form an agricultural series, but “shut its key” is an awkward collocation: one closes a door, not a key. Without a motivated context, the image becomes internally incoherent.
A stronger revision is “and watered it with patience until it bore fruit.” The criterion is not ornament for its own sake but coherent conceptual relations throughout the borrowed imagery.