Why is understanding the difference between temporary and eternal things important for Christians?

In the sermon, the preacher emphasizes the fleeting nature of earthly things versus the eternal significance of spiritual truths. He cites that while perishing 'meat' nourishes the body temporarily, the 'bread' from heaven, which is Christ, nourishes the soul for eternity (John 6:50). This distinction urges believers to valuate their pursuits and energies in light of eternal realities, encouraging them to labor not for what perishes but to seek the everlasting nourishment that comes from Christ alone. Such understanding fosters a mindset aligned with God’s kingdom, enabling Christians to live with purpose and eternal perspective.