4 There is no use trying to bring you back to the Lord again if you have once understood the Good News and tasted for yourself the good things of heaven and shared in the Holy Spirit, 5 and know how good the Word of God is, and felt the mighty powers of the world to come, 6 and then have turned against God. You cannot bring yourself to repent again if you have nailed the Son of God to the cross again by rejecting him, holding him up to mocking and to public shame.
Hi, this passage has not been fulfilled yet and comes with the introduction of the kingdom at the Lord's Second Coming so you could not be guilty unless you are exposed as having committed it. There is nothing to be worried about. I am 100 percent sure that when the kingdom arrives you will have the hope of being invited in that will produce great joy (known as the rapture) and have no desire to return to the life known before the kingdom’s arrival. There are steps that are taken first that will expose you as a chosen one: (1. You have to survive the Great Tribulation and be offered an invitation, (2. You must be willing to learn to fulfill the requirements of obtaining salvation which are streamed to the Mountain of God, (3 Your journey towards perfection cannot be undue once it has begun. So, it is impossible to sin or to return to an unrefined state of being. The condition of obtaining salvation takes years to complete, in the time that you devote to refining your body you will feel so much better and healthier, Revelation 20:5. There is nothing to worry about you must be able to SEE God's Kingdom activity first and also to be invited into it. Both things are nearly impossible to do without God's help and direction.