What do the seven baskets left over represent in biblical teaching?

In Mark 8, the seven baskets of leftovers after the feeding of the four thousand symbolize the inadequacy of human efforts to find fulfillment in temporal pleasures. The number seven represents completeness regarding creation and highlights that even after all our earthly pursuits, we can find ourselves spiritually unfulfilled. Herod's indulgence in pleasure serves as a warning that looking for life in the fleeting things of this world can lead to spiritual death. This teaches believers to seek their ultimate satisfaction and identity in Christ alone, who supplies all our needs.