Romans Chapter 2 : The Sin of Others is Our Sin, Too

“Blessed is the man that walks not in the counsel of the ungodly, nor stands in the way of sinners, nor sits in the seat of the scornful. But his delight is in the law of the Lord; and in his law doth he meditate day and night.”  Psalm 1:1, 2

“My son, if thou wilt receive my words, and hide my commandments with thee; so that thou incline thine ear unto wisdom, and apply thine heart to understanding; yea, if thou criest after knowledge, and liftest up thy voice for understanding; if thou seekest her as silver, and searchest for her as for hid treasures; then shalt thou understand the fear of the Lord, and find the knowledge of God.  For the Lord giveth wisdom; out of his mouth cometh knowledge and understanding.”  Proverbs 2:1-6

Here we have the secret of the understanding of the Bible: study and meditation, coupled with an earnest desire to know the will of God in order to do it.  “If any man will do his will, he shall know of the doctrine.”  John 7:17. Repetition review is one of the prime essentials to knowledge of the Bible. Not that any amount of study will compensate for lack of the Holy Spirit's guidance, but that the Holy Spirit witnesses through the word.