In ministry life there is the discussion of calling and equipping. Rightfully so: there are men who are called to particular work in the body. [See Ephesians 4:11]. These divine callings do lead to men entering the work of the ministry.
However, at some point a man has to want to do the work. He has to burn from within to persevere through the trials and temptations to do the work. Ministry life is demanding. There are the lost that need to hear the Gospel, Saints who need to be discipled, administrative needs and financial requirements. Plus the resistance from the enemy, sin within and without the camp and personal family demands. It’s enough to make you quit.
However Paul this, “Let us not lose heart in doing good, for in due time we will reap if we do not grow weary [Galatians 6:9]”; “But as for you, brethren, do not grow weary of doing good [II Thess 3:13]”; “For consider Him who has endured such hostility by sinners against Himself, so that you will not grow weary and lose heart [Hebrews 12:3]”; and John in Revelation writes, “you have perseverance and have endured for My name’s sake, and have not grown weary [Rev. 2:2-4]”.
The Scriptures acknowledge the temptation to quit and exhort you to persevere. So while you may have a calling to a particular work you still must find the desire within to persevere in the work of the calling to the end. Paul said, “the love of Christ constrained him” apparently to persevere. Either way “You got to want it” or you will grow weary and quit.