In Hebrews 6:4-8, Paul stated in the bible that it is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age, if they fall away, to be brought back to repentance, because to their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.
Land that drinks in the rain often falling on it and that produces a crop useful to those for whom it is farmed receives the blessing of God. But land that produces thorns and thistles is worthless and is in danger of being cursed. In the end it will be burned.
Read "The Parable of the Sower:" Luke 8:4-15. This verse will answer your question. You have to bear good fruit (Matthew 7:16-19).
Cross reference Luke 8:4-8 with verse Luke 8:11-15 to get a clear understanding of the parable.
Luke 8:4-5 While a large crowd was gathering and people were coming to Jesus from town after town, he told this parable: “A farmer went out to sow his seed." (Luke 8:11 The seed is the word of God). As he was scattering the seed, some fell along the path; it was trampled on, and the birds of the air ate it up. (Luke 8:12 Those along the path are the ones who hear, and then the devil comes and takes away the word from their hearts, so that they may not believe and be saved).
Luke 8:6-7 Some fell on rock, and when it came up, the plants withered because they had no moisture. Other seed fell among thorns, which grew up with it and choked the plants. (Luke 8:13 Those on the rock are the ones who receive the word with joy when they hear it, but they have no root. They believe for a while, but in the time of testing they fall away).
Luke 8:8 Still other seed fell on good soil. It came up and yielded a crop, a hundred times more than was sown. (Luke 8:15 But the seed on good soil stands for those with a noble and good heart, who hear the word, retain it, and by persevering produce a crop).
Also read read "The Parable of the Talents" in the bible: Matthew 25:14-30.
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Are you living in sin? If you are living in sin, than you need to reevaluate why you have falling away from the faith. You must keep and obey God's commandments in order to make it into the Kingdom of Heaven.
My advice: Let go of all the worldly desires that you harbor in your heart and focus only on God/Christ alone. Do not allow the stress of life to overcrowd your judgment and do not allow your evil ambitions to overcrowd your judgment either.
Read 1 Timothy 1:19. Paul stated that you must cling to your faith in Christ, and keep your conscience clear. For some people have deliberately violated their consciences; as a result, their faith has been shipwrecked.
True Christians are not of those who shrink back and are destroyed, but of those who believe and are saved. (Hebrews 10:35-39)
You must repent to God the father, and he will forgive you for your sins by purifying/sanctifying/cleansing you from all unrighteousness. Ask God to send you the Holy Spirit so that the Holy Spirit can guide you into all truth (John 16:13). If you are not aware of the Holy Spirit in your life, than you must keep searching/seeking/asking for it, and it will be known/giving to you.
{Luke 11:9-13} Click here to read the whole verse: http://www.biblegateway.com/passage/?search=Luke+11%3A9-13&version=NIV
You must know the father personally. You must also seek guidance from the Holy Spirit. READ: Matthew 7:21-23.
ACCORDING TO GOD'S OWN WORDS THROUGH THE PROPHETS:
John 6:45 It is written in the Prophets: 'They will all be taught by God.' Everyone who listens to the Father and learns from him comes to me.
READ: Hebrew 8/Hebrew 8:11-13 and John 14 in the bible.
In John 14:26, Jesus said, "The counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you."
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READ: 1 John 2:15-16 (Do Not Love the World)
Do not love the world or anything in the world. If anyone loves the world, the love of the Father is not in him. For everything in the world—the cravings of sinful man, the lust of his eyes and the boasting of what he has and does—comes not from the Father but from the world. The world and its desires pass away, but the man who does the will of God lives forever.
ALSO READ: Matthew 6:25-27 (Do Not Worry)
“Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more important than food, and the body more important than clothes? Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? Who of you by worrying can add a single hour to his life?