'Simple' in the Bible

The law of the Lord is perfect (flawless), restoring and refreshing the soul;The statutes of the Lord are reliable and trustworthy, making wise the simple.

Your precepts are fully confirmed and completely reliable;Holiness adorns Your house,O Lord, forever.

The Lord protects the simple (childlike);I was brought low [humbled and discouraged], and He saved me.

The unfolding of Your [glorious] words give light;Their unfolding gives understanding to the simple (childlike).