"For though by this time you ought to be teachers, you need someone to teach you again the basic principles of the oracles of God. You need milk, not solid food, for everyone who lives on milk is unskilled in the word of righteousness, since he is a child. 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 5:12
As evident by this scripture, the subject of mature versus immature Christians is as old as Christianity itself. The difference between the mature and immature in God encompasses several aspects, but at the core is knowing and understanding God's word. In order to know God's Word, one must study it. God's own Word, Jesus (John 1:1), contains His heart, His love, His will - His very essence. Our love for Jesus was defined by Jesus Himself when He said, "IF you love me, keep my commandments" (John 14:15) In order to keep His commandments, one must first know what His commandments are. In order to know what His commandments are, you must actually be a student of His Word (2 Tim 2:15). Being a student of the Word is not the summit of maturity, but the base camp from which you take the first steps toward reaching maturity. Once you have this very basic foundation, you may them begin to *build yourself up* into maturity (Jude 1:20). God took a pass on enlightening the believers of Hebrews 5:12 because they had not laid the basic foundation of His principles.
The six 'basic principles', or foundations of Christianity, referred to in Hebrews 5:12 are found in Hebrews 6:1-3:
"Therefore, leaving the discussion of the elementary principles of Christ, let us go on to perfection, not laying again the foundation of (1) repentance from dead works and of (2) faith toward God, of (3) the doctrine of *baptism(s)*, of (4) laying on of hands, of (5) resurrection of the dead, and of (6) eternal judgment."
You may think you know and have an understanding of these basics, but I encourage you to begin the lifelong journey to maturity - or to unlearn what you think you know and build again. I know of no better teacher or material to get you started than Derek Prince's "Foundations of Christian Living" video series. You'll notice that this is a FREE ten-part, ten-hour video teaching series, based solely on the opening three verses of Hebrews 6. I can hear the baby diapers squishing already - "I don't have the time" - but I guarantee, no matter what your level of maturity, you will be blessed and enlightened as you progress through the series, complete with downloadable study guides. Blessings...