The grace of God does NOT cover future unrepentant sins.

What shall we say then? Shall we continue in sin, that grace may abound? [2] God forbid. How shall we, that are dead to sin, live any longer therein? Romans 6:1-2 What then? shall we sin, because we are not under the law, but under grace? God forbid. Romans 6:15 Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. Hebrews 3:12 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, [27] But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries. Hebrews 10:26-27 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, [5] And have tasted the good word of God, and the powers of the world to come, [6] If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. Hebrews 6:4-6 For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error. [19] While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage. [20] For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. [21] For it had been better for them not to have known the way of righteousness, than, after they have known it , to turn from the holy commandment delivered unto them. [22] But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire. 2 Peter 2:18-22 Being justified freely by his grace through the redemption that is in Christ Jesus: [25] Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God; [26] To declare, I say , at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus. Romans 3:24-26