As we grow in the knowledge of grace, it is important we do not puff up but instead build others up.
Paul, in 1 Corinthians 8:1 says, "Knowledge puffs up, but love builds up" (see also 1 Corinthians 13:2).
In Ephesians 4:15, Paul says "speak the truth [about grace] in love."
It is easy for us, as we grow in the knowledge of grace, to become graceless to those who oppose us.
We can become prideful in our knowledge of grace and treat those who oppose us with impatience and unkindness.
We can become "grace know it all's" by treating those who oppose us as if we are brighter and smarter than them when it comes to Bible knowledge.
When this happens, we will turn people away from grace, and that is the last thing we want to do.
It's not that we should stop trying to help those who oppose us understand grace, but we should talk to them in a way that is not argumentative (Titus 3:9).
If they refuse to listen and learn about the gospel of God's grace, let it go and keep loving them with kindness.
By communicating the good news of grace in love (patience, kindness, gentleness, self-control) and by loving those we are communicating to, we will more likely turn people to grace, and that is exactly what we want to do!
When we do this, their lives will be built up with the knowledge of grace (Acts 20:32).