Heb 12:7

“"Ye endure chastisement" (he says); not for punishment, nor for vengeance, nor for suffering. See, from that from which they supposed they had been deserted of God, from these he says they may be confident, that they have not been deserted. It is as if he had said, Because ye have suffered so many evils, do you suppose that God has left you and hates you? If ye did not suffer, then it were right to suppose this. For if "He scourgeth every son whom He receiveth," he who is not scourged, perhaps is not a son. What then, you say, do not bad men suffer distress? They suffer indeed; how then? He did not say, Every one who is scourged is a son, but every son is scourged. For in all cases He scourges His son: what is wanted then is to show, whether any son is not scourged. But thou wouldest not be able to say: there are many wicked men also who are scourged, such as murderers, robbers, sorcerers, plunderers of tombs. These however are paying the penalty of their own wickedness, and are not scourged as sons, but punished as wicked: but ye as sons.”

“Fathers are in the habit of disciplining their true children, and if they see them caned by the teachers, they do not worry; they see the fruit coming from the discipline. But they despise illegitimate children and do not accord them equal attention. So if you also avoid discipline, you are of the number of the illegitimate.”

“Using the example of those whom they thought were abandoned by God, he shows them that they were an object of God's care. For if you were free from afflictions, it would turn out that you are illegitimate children, and not sons. For what father concerns himself with the upbringing and chastity of illegitimate sons? But since you are subjected to oppression, your life is therefore chaste and temperate — just as all the aforementioned were evidently righteous, who were also called sons of God: evidently, it does not contradict this that God treats you as sons and cares for you, so that you, being undisciplined, would not fall away, and so that He would not deprive you of your inheritance on account of this.”

“675. – Then (v. 7) he shows the meaning of the above scriptural quotation: first, he explains the meaning of the admonition; secondly, the meaning of the reason; thirdly, he shows that the reason is fitting (v. 7c). 676. – The Apostle's advice was not to neglect the Lord's discipline and not to become weary. But he includes both in these words, for not to neglect and not to grow weary are nothing less than to persevere in discipline; hence Job (6:10): 'This is my consolation that afflicting me with sorrow, he spare not'; 'Embrace discipline, lest at any time the Lord be angry' (Ps. 2:12). He told us why we should not be negligent when he said, Whom the Lord loves he chastises; hence, he says here: God is treating you as sons. As if to say: Persevere, because he deals with you as with His sons: 'You shall call me Father and shall not cease to walk after me' (Jer. 3:19). Then he shows that the reason is fitting when he says, What son is there whom his father does not discipline [correct]? For it is the father's duty to correct his son: 'He that spares the rod hates his son; but he that loves him corrects him betimes' (Pr. 13:2); 'A horse not broken becomes stubborn; and a child left to himself will become headstrong' (Sir. 30:8). Therefore, correction is necessary, as a sting of the flesh was given to Paul, lest he fall (2 Cor. 12:7).”