If you find great joy in witnessing to people about the salvation of God offered through faith in Jesus Christ, then everyone that you speak to must be getting saved. None of them mock or deride you, none cast insults or hurl harsh words at you, every one of them is accepting of all you say and fall on their knees on that very spot. “Who hath believed our report? and to whom is the arm of the LORD revealed?” (Isaiah 53:1)
To offer Jesus Christ to people is to bring ridicule upon yourself, to call upon the world to hate you, to be set apart from nearly all on this planet. To serve Jesus Christ is to know misery and joy at the same time, to feel pain in the flesh and thank Him for it, to know the anguish of this sinful world, and live in it for His glory.
The man of God looks forward in anticipation for death, “We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord.” (2 Cor. 5:8) This man knows that most of the people that he speaks to are going to spend eternity in the Lake of Fire. “For many are called, but few are chosen.” (Matt. 22:14) Yet he keeps calling, he keeps studying, and each day he awakes he says to himself, “Perhaps today.”
If you have a burden for the lost, then you know suffering, if the purpose of your life is to see God exalted above the heavens, then you know the pain of the soul, and very likely that of the flesh also, and at times, your patience wears thin. But you arise the next morning, and you get back to work, for that is what you have been called to do.
There is little rest on the front lines of the battlefield.
There is a big difference between actively seeking the lost and waiting for them to cross your path, go ye into all the world does not mean to sit in the comfort of your life and wait for those in the world to come to you. Men of God seek the lost, they take every opportunity to reach out to them, they put themselves in positions and places where the wicked will cross their path or they theirs. The souls of these people matter, and this is how the Almighty has chosen to use them. But there are days the burden can be overwhelming, and those days can stretch out for quite a while sometimes.
It is beyond rare to meet someone who is being called by the Lord and who will respond affirmatively to His calling, most will politely despise you. If you cannot see them screaming forever, you cannot have a heart for them. The battle is not just against their nature to defend their right to not be obedient to Him who in the end all will serve, but against their father, our adversary, he will do all he can to snatch that seed away. But you must always remember, it is God that gives the harvest, you are to obey and serve as you have been called to, without thought to the possible consequences to yourself, or the responses that they may offer.
Every circumstance is an opportunity to lift up the name of Jesus Christ, and each day that passes is one day closer to never being able to do that again.
The man that serves the Almighty is well acquainted with frustration, it is part of his waking hours each and every day, but he is also firm in his convictions, his conscience is aware of what he has been called to do, his spirit will know rest from these labors soon enough.
If your walk with the Lord is comfortable, if life is wonderful and lacking in any frustration or turmoil, then either everyone that you are witnessing to is being saved the moment you speak to them, or you are not reaching out to others for the glory of God near enough.