How do we know that chastisement is a sign of God's love?

The writer of Hebrews explicitly states that chastisement is indicative of our relationship with God as His legitimate children. In Hebrews 12:6, it is written, 'For whom the Lord loveth, he chasteneth.' This means that God's loving discipline is part of His relationship with His elect. It corrects and molds us for our ultimate good, as God desires to produce holiness and fruitfulness in our lives. Chastisement acts as a reminder that we belong to Him and that He is actively involved in shaping our character toward His holiness.