"For consider him that endured such contradiction of sinners against himself, lest ye be wearied and faint in your minds." (Hebrews 12:3)
The Christian life and ministry can grow wearisome and hard at times, but with Christ Himself as our example, the Lord admonishes us not to faint, but always to press on.
If our prayers seem to go unanswered, He reminds us that "men ought always to pray, and not to faint" (Luke 18:1). When we grow tired and are tempted to quit, the Scriptures assure us that "in due season we shall reap, if we faint not" (Galatians 6:9).
When God has entrusted us with a certain ministry, we need to learn to say, as with Paul, "Therefore seeing we have this ministry, as we have received mercy, we faint not" (2 Corinthians 4:1). As we see God's mercy-drops of blessing begin to fall, we then can say, as he did, "For which cause we faint not; but though our outward man perish, yet the inward man is renewed day by day" (2 Corinthians 4:16). We can even encourage others to faint not, as He did: "Wherefore I desire that ye faint not at my tribulations for you, which is your glory" (Ephesians 3:13).
The same Greek word is translated "weary" in 2 Thessalonians 3:13: "Be not weary in well doing." Finally, even when God has to rebuke us, we must learn to take it patiently. "Despise not thou the chastening of the Lord, nor faint when thou art rebuked of him" (Hebrews 12:5).
But with all these strong exhortations to faint not, we also need to know just how we can obtain the needed strength to keep on keeping on. The answer is in God's great counsel to Isaiah: "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" (Isaiah 40:31). HMM