Ephesians 3:10
Crisis in life is because of the lack of wisdom. Wisdom is the ability to interprete life as God sees it. When you refuse to grow you become a concern to God and He puts you in the level of sinners, phillipians 3:11-14. For you to have this kind of wisdom to work in the supernatural you must be able to grow spiritually.
WHY SPIRITUAL GROWTH
Its a comand, God wants you to grow(proverbs 4:18)
To be able to face life challenges (mark 4:35-39) (Ephesians 6:10-16)
To enjoy all round peace.
With all this there is only one way to grow (for the fact you are an adult dosn't mean you have grown ) which is the word of God in you.