GROW IN GRACE

  You therefore, beloved, since you know [this] beforehand, beware lest you also fall from your own steadfastness, being led away with the error of the wicked; but grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him [be] the glory both now and forever. Amen. 2 Peter 3:17-18

GOD'S grace is GOD'S unmerited favour on man.

Moreover the law entered that the offense might abound. But where sin abounded, grace abounded much more, Romans 5:20

Just because GOD extends sufficient grace to us, covering our sin and revealing His favour to us, it does not mean that we can take advantage of this grace to continue in sin. Having experienced His grace, we need to walk in obedience to GOD, pleasing Him. GOD understands our situations, sees our heart, strengthens us in our weaknesses and graciously forgives our sins. If we wilfully sin and walk in rebellion and stubbornness, we fall from grace, and there will be no more opportunity for us to be saved.

  For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins,  but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries.  Anyone who has rejected Moses' law dies without mercy on [the testimony of] two or three witnesses. Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace?  For we know Him who said, "Vengeance is Mine, I will repay," says the Lord. And again, "The LORD will judge His people." Hebrews 10:26-30

Another important sign of growing in grace is being gracious towards others. Once we genuinely experience and receive the grace of GOD, such grace will also flow from us to others.

  Let all bitterness, wrath, anger, clamor, and evil speaking be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you. 
Ephesians 4:31-32

Therefore, to grow in grace, we need to walk in obedience to GOD and extend grace to others.