"But grow in the grace and knowledge of our Lord and Savior Jesus Christ" 2 Peter 3:18. Attribute of a maturing disciple. What does it mean to grow in grace and truth? Jesus is 100% Grace and 100% Truth.
Grace is God doing for us what we can't do for ourselves; Identifying areas we should grow in, requires a spiritual mentor; Give it to God; Read the Gospels and see how Jesus did things for others that they couldn't do for themselves (Matthew 8:5) "Unmerited Favor" doesn't quite cut it. Grace is when God does something for you that you can't do for your self, like dying for our sins.
Truth is being honest with reality as perceived by God; Embrace your shortcomings; Ask a spiritual mentor for guidance; Then read the Gospels and identify the difference in how Jesus lived life and how you live life. (John 11, the death of Lazerith) God is reality; He us absolutely dependable. Truth is being honest with our reality as perceived by God.