A BLESSING, OR A CURSE. Hebrews 6:7-8 It is important to emphasize that for those without Christ, there is still hope while they have life. God is willing to save anyone who repents of their sins and comes in faith to receive Christ as their Savior. The challenge here is that when a person who has been enlightened or has tasted spiritual truths goes back to Judaism, they are returning to what rejected and crucified Christ. You won’t be able to change their minds, and these two paths do not align. The only way repentance occurs is through the convicting power of the Holy Spirit.
The Holy Spirit convicts people of their sins, lack of righteousness, and the coming judgment on those who are not saved. When that happens, and those who have experienced that conviction deliberately reject it, there is no other power that can reach them. To reject the Holy Spirit is to reject God, and only God can save a person.
The illustration of a field is given to emphasize and clarify a point. The seeds of the Gospel are sown by God in the souls of those who hear the message of salvation by grace. The field (hearers) has been made ready to receive the seed (the Gospel) that is sown by the farmer (God). When the seed is sown and rain (the work of the Holy Spirit) makes the earth in a condition to receive what is needed to germinate and produce life from the seed that has been planted.
However, on the same ground, there are thorns and thistles that are the result of the curse of sin. The same rain that produces fruitfulness in good plants for the farmer causes the thorns and thistles to grow. God provides what is needed in mercy and grace so believers will bear spiritual fruit, and in holiness and justice, He rejects the thorns and thistles despite the blessing of the Spirit of God working in the souls of those who profess to be believers in Christ but are not. They have been enlightened, tasted the heavenly gift, and experienced the goodness of God's word and promised blessings in the future, but they remain like thorns and thistles and will be burned.
When the Holy Spirit opens a person's eyes to see the truth, they may verbally agree or accept what they've heard, but if they reject what they know intellectually—without faith—there is no hope for them anymore.
Believing Christians persevere and stay faithful to God through both difficult and joyful times. Unbelievers might act like children of God, but when they are exposed to salvation and deliberately reject Christ, they are rejected—they remain lost. Those who turn away from Christ will not be saved. The sacrifice of Christ was made once and for all and does not need to be repeated for any reason. If someone's heart becomes hardened, repentance will not happen again. God's word may enlighten a person; they might taste what it means to be a Christian; the convicting power of the Holy Spirit could even influence them. Perhaps they have even taken part in Christian activities. But this does not mean they are genuinely children of God.