HEBREWS:Christian Maturity; "Surely we don’t need to start again with the fundamental importance of repenting from evil deeds and placing our faith in God!"

You have been believers so long now that you ought to be teaching others. Instead, you need someone to teach you again the basic things about God’s word. You are like babies who need milk and cannot eat solid food. For someone who lives on milk is still an infant and doesn’t know how to do what is right. Solid food is for those who are mature, who through training have the skill to recognize the difference between right and wrong.(Hebrews 5:12-14 NLT)

This chapter of Hebrews really challenges us who are Christians to "grow-up"! So let us stop going over the basic teachings about Christ again and again. Let us go on instead and become mature in our understanding. Surely we don’t need to start again with the fundamental importance of repenting from evil deeds and placing our faith in God. You don’t need further instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment. And so, God willing, we will move forward to further understanding. (Hebrews 6:1-3)

For it is impossible to bring back to repentance those who were once enlightened—those who have experienced the good things of heaven and shared in the Holy Spirit, who have tasted the goodness of the word of God and the power of the age to come— and who then turn away from God. It is impossible to bring such people back to repentance; by rejecting the Son of God, they themselves are nailing him to the cross once again and holding him up to public shame. When the ground soaks up the falling rain and bears a good crop for the farmer, it has God’s blessing. But if a field bears thorns and thistles, it is useless. The farmer will soon condemn that field and burn it. (Hebrews 6:4-8 NLT)

Jesus taught about four different kinds of people, using the parable of a farmer throwing seeds on four different kinds of ground.  The above verses explain the person whose heart is like the "stony ground": “Listen! Behold, a sower went out to sow. Some fell on stony ground, where it did not have much earth; and immediately it sprang up because it had no depth of earth. But when the sun was up it was scorched, and because it had no root it withered away. ...  The sower sows the word. These likewise are the ones sown on stony ground who, when they hear the word, immediately receive it with gladness;  and they have no root in themselves, and so endure only for a time. Afterward, when tribulation or persecution arises for the word’s sake, immediately they stumble. (Mark 4:3, 5-6, 14, 16-17) People can appear to be believers but that doesn't mean they are a Christian (see Christianity vs. Religion: Watch Out for Counterfeits).  As stated about, So let us stop going over the basic teachings about Christ again and again. 

The Bible is clear in whom we should believe and what we should believe in order to be saved, and then how we should behave once we become saved.  If anyone chooses not to believe, that is their choice.  For the rest of us, let's move on. Dear friends, even though we are talking this way, we really don’t believe it applies to you. We are confident that you are meant for better things, things that come with salvation. For God is not unjust. He will not forget how hard you have worked for him and how you have shown your love to him by caring for other believers, as you still do. Our great desire is that you will keep on loving others as long as life lasts, in order to make certain that what you hope for will come true. Then you will not become spiritually dull and indifferent. Instead, you will follow the example of those who are going to inherit God’s promises because of their faith and endurance. (Hebrews 6:9-12 NLT) 

This brings us to the example Christ taught of the seed that "fell among thorns": And some seed fell among thorns; and the thorns grew up and choked it, and it yielded no crop. Now these are the ones sown among thorns; they are the ones who hear the word, and the cares of this world, the deceitfulness of riches, and the desires for other things entering in choke the word, and it becomes unfruitful. (Mark 4:7, 18-19)  These are Christians, but they don't grow in their faith, hence the use of the words becomes unfruitful; and also, You are like babies who need milk and cannot eat solid food.   

We all have to start somewhere, as newborn babes, desire the pure milk of the word, that you may grow thereby, if indeed you have tasted that the Lord is gracious. (I Peter 2-3) But we should not end close to being in the same condition that we started. If anyone’s work which he has built on it endures, he will receive a reward. If anyone’s work is burned, he will suffer loss; but he himself will be saved, yet so as through fire. (I Corinthians 3:14-15)

God has given us "His promise and His oath", For example, there was God’s promise to Abraham. Since there was no one greater to swear by, God took an oath in his own name, saying: “I will certainly bless you, and I will multiply your descendants beyond number." [Gensis 22:17] Then Abraham waited patiently, and he received what God had promised. Now when people take an oath, they call on someone greater than themselves to hold them to it. And without any question that oath is binding. God also bound himself with an oath, so that those who received the promise could be perfectly sure that he would never change his mind. So God has given both his promise and his oath. These two things are unchangeable because it is impossible for God to lie. Therefore, we who have fled to him for refuge can have great confidence as we hold to the hope that lies before us. This hope is a strong and trustworthy anchor for our souls. It leads us through the curtain into God’s inner sanctuary. (Hebrews 6:13-19 NLT)

Let's be like the seed that fell on "good ground": But other seed fell on good ground and yielded a crop that sprang up, increased and produced: some thirtyfold, some sixty, and some a hundred.” And He said to them, “He who has ears to hear, let him hear!” ... But these are the ones sown on good ground, those who hear the word, accept it, and bear fruit: some thirtyfold, some sixty, and some a hundred.”(Mark 4:8-9, 20)  “God is not a man, that He should lie, Nor a son of man, that He should repent. Has He said, and will He not do? Or has He spoken, and will He not make it good? (Numbers 23:19) 

We can believe God and trust God, so let's start living like we do, sharing the Truth with others in the hope of leading them to Christ also!  But understanding that we can't save anyone, not even ourselves!  We are to "sow the seed", share the Word of God, and let God do the rest.  Those who don't believe will suffer the consequences.  Those who believe, God will help them and us to grow to maturity!