Galatians 6:9,10
9. And let us not be weary in well doing: for in due season we shall reap, if we faint not.
10. As we have therefore opportunity, let us do good unto all men, especially unto them who are of the household of faith.

Isaiah 40:31
31. But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.

Psalms 27:14
Wait on the LORD: be of good courage, and He shall strengthen your heart: wait, I say, on the LORD.

Proverbs 4:23-27
23. Keep your heart with all diligence; for out of it are the issues of life.
24. Put away from you a deceitful mouth, and perverse lips put far from you.
25. Let your eyes look directly forward, and let your eyelids look straight before you.
26. Ponder the path of your feet, and let all your ways be established.
27. Turn not to the right hand nor to the left: remove your foot from evil.