What has the ability to reveal our true character as Christians?

Real Dudes,
I heard this quote the other day, “Sports don't build character, they reveal it.” According to the passages below, what has the ability to reveal our true character as Christians? What are you learning about your true character? What, if anything, is the Lord encouraging you to change? Enjoy your time of self-evaluation. 
Practicing His Presence,
Nate

1 Peter 1:6-7 (NLT) 6 So be truly glad. There is wonderful joy ahead, even though you must endure many trials for a little while. 7 These trials will show that your faith is genuine. It is being tested as fire tests and purifies gold—though your faith is far more precious than mere gold. So when your faith remains strong through many trials, it will bring you much praise and glory and honor on the day when Jesus Christ is revealed to the whole world.

Job 23:10 (NLT) “But he knows where I am going. And when he tests me, I will come out as pure as gold.

James 1:2-4 (NLT) 2 Dear brothers and sisters, when troubles of any kind come your way, consider it an opportunity for great joy. 3 For you know that when your faith is tested, your endurance has a chance to grow. 4 So let it grow, for when your endurance is fully developed, you will be perfect and complete, needing nothing.

Romans 5:3-5 (NLT) 3 We can rejoice, too, when we run into problems and trials, for we know that they help us develop endurance. 4 And endurance develops strength of character, and character strengthens our confident hope of salvation. 5 And this hope will not lead to disappointment. For we know how dearly God loves us, because he has given us the Holy Spirit to fill our hearts with his love.

2 Peter 1:3-9 (NLT) 3 By his divine power, God has given us everything we need for living a godly life. We have received all of this by coming to know him, the one who called us to himself by means of his marvelous glory and excellence. 4 And because of his glory and excellence, he has given us great and precious promises. These are the promises that enable you to share his divine nature and escape the world’s corruption caused by human desires. 5 In view of all this, make every effort to respond to God’s promises. Supplement your faith with a generous provision of moral excellence, and moral excellence with knowledge, 6 and knowledge with self-control, and self-control with patient endurance, and patient endurance with godliness, 7 and godliness with brotherly affection, and brotherly affection with love for everyone. 8 The more you grow like this, the more productive and useful you will be in your knowledge of our Lord Jesus Christ. 9 But those who fail to develop in this way are shortsighted or blind, forgetting that they have been cleansed from their old sins.