Childish and impulsive thinking, combined with a lack of self discipline, will keep all of us spiritually immature and dull. However, when we listen carefully to Jesus’ teachings, and prayerfully determine the differences between right and wrong, and then choose to do the right things, that’s what makes us grow to maturity, and much more capable of grasping more than just the basic things.

Scripture References: 

Hebrews 5:11–14 (NLT)
Matthew 7:24-27 (NLT)
Titus 2:11–14 (NLT)
1 Kings 3:7–9 (NLT)
Galatians 5:16–17 (NLT)