Question:
How does Hebrews 6:4-6 fit in with a person away from the Lord?

Answer:
This passage is talking about the same people as in Hebrews 10:26, who have a “knowledge” of the truth but have not believed in Christ. They have merely “tasted” heavenly things.

The Greek word translated “partakers” in Hebrews 6:4 is a limited external partnership. Many go to church and are baptized, but yet are not saved. But if they “fall away,” which means they turn away and do not receive Christ, they cannot be saved because there is no other “sacrifice for sin” (Hebrews 10:26).
This is seen in Mark 4:1-20: the parable of the sower. Only one of four types of ground bear fruit. One can be a partaker of the things of the Holy Spirit without actually being a partaker of the Holy Spirit, as an inward and full partnership.
If a person repeatedly rejects Christ, he cannot be saved!! John 3:16 shows the wonderful truth of “eternal life” to all who believe. We should not underestimate the power of prayer in seeking to draw souls, whether saved or unsaved, to Christ through our lives and lips.