1 John 2:5

But whoever habitually keeps His word and obeys His precepts (and treasures His message in its entirety), in him the love of God has truly been perfected (it is completed and has reached maturity). By this we know (for certain) that we are in Him.  

The word of God is a treasure refined like pure gold.  All knowledge, wisdom, and guidance communicated in the pages of the Bible.  When we first love God and His word, we know that Jesus abides in our hearts and we in Him.  Every day is a new day to go deeper in the word and walk out our faith.