Handling Criticism

Listen
Know this, my beloved brothers: let every person be quick to hear, slow to speak, slow to anger; for the anger of man does not produce the righteousness of God. (James 1:19-20 ESV)
If one gives an answer before he hears, it is his folly and shame. (Proverbs 18:13 ESV)
Listen to advice and accept instruction, that you may gain wisdom in the future. (Proverbs 19:20 ESV)
The person who hears the reproof that leads to life is at home among the wise. The one who refuses correction despises himself, but whoever hears reproof acquires understanding. (Proverbs 15:31-32 NET)

Attitude
The fear of the LORD is the beginning of knowledge; fools despise wisdom and instruction. (Proverbs 1:7 ESV)
The fear of the LORD is instruction in wisdom, and humility comes before honor. (Proverbs 15:33 ESV)

Warnings
Whoever loves discipline loves knowledge, but he who hates reproof is stupid. (Proverbs 12:1 ESV)
The way of a fool is right in his own eyes, but a wise man listens to advice. (Proverbs 12:15 ESV)
Poverty and disgrace come to him who ignores instruction, but whoever heeds reproof is honored. (Proverbs 13:18 ESV)
Whoever ignores instruction despises himself, but he who listens to reproof gains intelligence. (Proverbs 15:32 ESV)
A rebuke goes deeper into a man of understanding than a hundred blows into a fool. (Proverbs 17:10 ESV)
It is better for a man to hear the rebuke of the wise than to hear the song of fools. (Ecclesiastes 7:5 ESV)

Response
A soft answer turns away wrath, but a harsh word stirs up anger. (Proverbs 15:1 ESV)
If possible, on your part, live at peace with everyone. (Romans 12:18 HCSB)
Put on then, as God’s chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. (Colossians 3:12-13 ESV)

Pray
But I say to you, Love your enemies and pray for those who persecute you, (Matthew 5:44 ESV)
If any of you lacks wisdom, let him ask God, who gives generously to all without reproach, and it will be given him. (James 1:5 ESV)

Charles Haddon Spurgeon on Criticism in a sermon delivered on 1st July 1888:
QUOTE
Brother, if any man thinks ill of you, do not be angry with him; for you are worse than he thinks you to be. If he charges you falsely on some point, yet be satisfied, for if he knew you better he might change the accusation, and you would be no gainer by the correction. If you have your moral portrait painted, and it is ugly, be satisfied; for it only needs a few blacker touches, and it would be still nearer the truth.
UNQUOTE