How do we know that grace is sufficient for our spiritual growth?

The sufficiency of grace for spiritual growth is clearly articulated in 2 Corinthians 12:9, where Paul recounts God's response to his pleas for relief from a thorn in the flesh: 'My grace is sufficient for you, for my strength is made perfect in weakness.' This illustrates that as we confront our weaknesses and sins, we are led to rely more fully on God's grace. The growing awareness of our failings fosters deeper reliance on His sufficiency. Thus, spiritual growth is not a matter of human effort but of humbly depending on the grace that God supplies, allowing our weaknesses to draw us closer to Him.