Luke 18:1 tells us we should always pray and not give up.
II Corinthians 4:16 tells us we should remember that we are being renewed inwardly day by day.
Galatians 6:9 tells us that we should focus on the harvest that will come if we do not give up.
Ephesians 3:12-13 tells us that we should find comfort in the amazing ability we have to approach God
with freedom and confidence.
II Thessalonians 3:13 tells us that we should just keep doing what is right.
And finally Hebrews 12:3 tells us that we should think about Jesus and what He endured on our behalf. Nothing we are going through will compare with that.
These are a few verses that help me to keep things in perspective when I lose heart and I hope they will help you, too. We have to have resources to encourage us on the journey!