How do we know that all people are naturally inclined to earthly things?

The inclination of individuals towards earthly matters is rooted in their natural state, as articulated in Romans 8:5, which states that those who live according to the flesh set their minds on the things of the flesh. This earthly mindset reflects a deeper spiritual reality, where unconverted individuals may lift their hearts towards heavenly things temporarily but ultimately fall back to their earthly nature. The metaphor of Earth as a 'heavy and lumpish body' signifies that unless one is transformed by the Holy Spirit, their natural disposition will always gravitate towards the material and temporal rather than the spiritual and eternal.