Sweet food of sweetly uttered knowledge.

The phrase likens knowledge—especially when expressed with eloquence—to nourishment: something that sustains and delights. “Sweetly uttered” suggests that the manner of expression matters as much as the matter itself; learning becomes more readily received when it is shaped by artful language. In Sidney’s literary milieu, this aligns with a humanist defense of poetry and rhetoric as vehicles that can make instruction pleasurable, joining delight to edification. The line therefore gestures toward an ideal of writing (and teaching) in which style is not ornament alone but a means of making wisdom attractive and memorable.