The phrase, “Know ye not” is used 14 times in the KJV of the New Testament. While there are 3 different phrases that are translated with these three words, all three phrases mean basically the same thing: “Do you not understand” or, “Do you not see?” In each of these passages, the phrase is used to introduce a question about the topic at hand; but it is also used with a level of incredulity showing that these are things the audience should have already understood, but for some reason did not.
Consider each of these instances; do we understand the principles being addressed and the context in which they are given? If not, maybe we need to spend a little more time in the contexts of these statements until we do; because each of these (with the exception of the first, which was said to the disciples during Jesus’ ministry) is written to Christians who are already serving God and should comprehend these principles.
Mark 4:13 (in the context of the parable of the soils) – Know ye not this parable? and how then will ye know all parables?
Romans 6:3 – Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
Romans 6:16 – Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?
Romans 7:1 – Know ye not, brethren, (for I speak to them that know the law,) how that the law hath dominion over a man as long as he liveth?
1 Corinthians 3:16 – Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you?
1 Corinthians 5:6 – Know ye not that a little leaven leaveneth the whole lump?
1 Corinthians 6:3 – Know ye not that we shall judge angels?
1 Corinthians 6:9 – Know ye not that the unrighteous shall not inherit the kingdom of God?
1 Corinthians 6:15 – Know ye not that your bodies are the members of Christ?
1 Corinthians 6:16 – What? know ye not that he which is joined to an harlot is one body?
1 Corinthians 6:19 – What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?
1 Corinthians 9:24 – Know ye not that they which run in a race run all, but one receiveth the prize?
2 Corinthians 13:5 – Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?
James 4:4 – Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God?