2 Timothy 4:5-8 (NKJV) But you be watchful in all things, endure afflictions, do the work of an evangelist, fulfill your ministry.
6 For I am already being poured out as a drink offering, and the time of my departure is at hand.
7 I have fought the good fight, I have finished the race, I have kept the faith.
8 Finally, there is laid up for me the crown of righteousness, which the Lord, the righteous Judge, will give to me on that Day, and not to me only but also to all who have loved His appearing.

Gal 6:9 (KJV) And let us not be weary in well doing: for in due season we shall reap, if we faint not.

Matt 24:13- (The Message) "Staying with it — that's what God requires. Stay with it to the end. You won't be sorry, and you'll be saved.

#1- reset your thinking
1 Corinthians 9:24-27 (NLT)
24 Don’t you realize that in a race everyone runs, but only one person gets the prize? So run to win! 
25 All athletes are disciplined in their training. They do it to win a prize that will fade away, but we do it for an eternal prize. 
26 So I run with purpose in every step. I am not just shadowboxing. 
27 I discipline my body like an athlete, training it to do what it should. Otherwise, I fear that after preaching to others I myself might be disqualified.

#2- mend some fences

#3- change your OUTLOOK

2 Corinthians 12:9-10 (NLT)
9 Each time he said, “My grace is all you need. My power works best in weakness.” So now I am glad to boast about my weaknesses, so that the power of Christ can work through me. 
10 That’s why I take pleasure in my weaknesses, and in the insults, hardships, persecutions, and troubles that I suffer for Christ. For when I am weak, then I am strong.

Acts 20:24 (NLT) But my life is worth nothing to me unless I use it for finishing the work assigned me by the Lord Jesus—the work of telling others the Good News about the wonderful grace of God.