Read Psalm 119:49-56.
Physical maturity can be mostly self-evident as children grow and adults grow older. Spiritual maturity is not immediately discerned but certainly can be observed over time. Nothing reveals the depth of one's walk with God quicker than trouble and stress.
The psalmist, in this seventh stanza, continued to reference some arrogant, wicked mocker of his faith. It made him rage inside with anger (v.53). So, how does this penman that God used to write this portion of the Scriptures respond in a spiritually mature way?
1. He found hope in the Word of God. (v.49)
2. He found life-giving comfort in the Word of God. (v.50,52)
3. He found the Word of God made him sing. (v.54)
4. He found solace in the Word of God in the darkest hours. (v.55)
5. He found God's blessing through faithful obedience to God's Word. (v.56)
An infant requires someone else to feed them and do everything for them. As one grows up, they learn to feed themselves. Spiritual maturity is knowing the Scriptures and how to put them into practice.
"But solid food is for the mature, for those who have their powers of discernment trained by constant practice to distinguish good from evil." (Hebrews 5:14)