Tribulation

The fact of tribulation
John 16:33 In the world ye shall have tribulation
1 Thessalonians 3:4 For verily, when we were with you, we told you before that we should suffer tribulation; even as it came to pass, and ye know.

The reason for tribulation
2 Timothy 3:12 Yea, and all that will live godly in Christ Jesus shall suffer persecution. 
James 4:4 Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? whosoever therefore will be a friend of the world is the enemy of God.

The reaction to tribulation
Romans 5:3 And not only so, but we glory in tribulations also..
Ephesians 3:13 Wherefore I desire that ye faint not at my tribulations for you, which is your glory. 

The results of tribulation
Romans 5:3-5 ...knowing that tribulation worketh patience; And patience, experience; and experience, hope: And hope maketh not ashamed; because the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us. 
2 Corinthians 7:4 Great is my boldness of speech toward you, great is my glorying of you: I am filled with comfort, I am exceeding joyful in all our tribulation. 
1 Peter 3:14 But and if ye suffer for righteousness' sake, happy are ye