WHY can’t you? Because the carnal mind can not understand divine truth without the Spirit’s teaching.
BUT the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them because they are spiritually discerned.
I Corinthians 2:14.
MANY shall be purified, and made white, and tried; but the wicked shall do wickedly; and none of the wicked shall understand; but the wise shall understand.
Daniel 12:10.
Do God’s will, and you can understand.
IF any man will do His will he shall know of the doctrine, whether it be of God, or whether I speak of myself.
John 7:17.
You ask, How may I KNOW?
1st. Pray.
IF any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him.
James 1:5.
OPEN thou mine eyes, that I may behold wondrous things out of thy law.
Psalms 119:18.
THAT which I see not teach thou me.
Job 34:32.
2nd. Study your Bible.
SEARCH the Scriptures; for in them ye think ye have eternal life: and they are they which testify of me.
John 5:39.
FOR my thoughts are not your thoughts, neither are your your ways my ways, saith the Lord.
FOR as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts.
Isaiah 55:8-9.
THEN shall we know, if we follow on to know the Lord.
Hosea 6:3.