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.