Jesus opened their minds to understand the Scriptures.

"He opened their minds to understand the scriptures."  (Luke 24: 45 NABRE)

After the Resurrection, Jesus opened the minds of His apostles to understand the Scriptures.  Unless the Lord Builds the House, they labor in vain who builds it. (Psalm 27: 1).  Unless the Lord opens your mind to understand the Scriptures you read and study the Scriptures in vain.  (Cf Luke 24: 45).  In vain you burn the midnight oil and buy expensive commentaries.
Ask the Lord repeatedly in prayer to open your mind to understand the Scriptures.

Remember:  The word of God is the sword of the Spirit.  (Cf Ephesians 6: 17).  Cultivate the friendship of the the Holy Spirit.  "For wisdom opened mouths that were mute and gave eloquence to the tongues of infants."  (Wisdom 10: 20 - 21 NABRE)

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