TRUTH 2 Corinthians 4:1-2

Therefore, since through God's mercy we have this ministry, we do not lose heart. Rather, we have renounced secret and shameful ways; we do not use deception, nor do we distort the word of God. On the contrary, by setting forth the truth plainly we commend ourselves to everyone's conscience in the sight of God. 

Therefore, since through God's mercy we have this ministry 
1 Timothy 1:13  Even though I was once a blasphemer and a persecutor and a violent man, I was shown mercy because I acted in ignorance and unbelief.
1 Timothy 1:16  But for that very reason I was shown mercy so that in me, the worst of sinners, Christ Jesus might display his immense patience as an example for those who would believe in him and receive eternal life.

we do not lose heart 
2 Corinthians 4:16-17  Therefore we do not lose heart. Though outwardly we are wasting away, yet inwardly we are being renewed day by day. For our light and momentary troubles are achieving for us an eternal glory that far outweighs them all.
Psalm 18:45  They all lose heart; they come trembling from their strongholds.
Isaiah 40:30-31  Even youths grow tired and weary, and young men stumble and fall; but those who hope in the LORD will renew their strength. They will soar on wings like eagles; they will run and not grow weary, they will walk and not be faint.

Rather, we have renounced secret and shameful ways 
Romans 6:1-2  What shall we say, then? Shall we go on sinning so that grace may increase? By no means! We are those who have died to sin; how can we live in it any longer?
1 Corinthians 4:5  Therefore judge nothing before the appointed time; wait until the LORD comes. He will bring to light what is hidden in darkness and will expose the motives of the heart. At that time each will receive their praise from God.
Hebrews 4:12  For the word of God is alive and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.

by setting forth the truth plainly we commend ourselves to everyone's conscience in the sight of God. 
2 Corinthians 5:11  Since, then, we know what it is to fear the Lord, we try to persuade others. What we are is plain to God, and I hope it is also plain to your conscience.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide.