What if our witnessing efforts are rejected?
Galatians 6:9 "And let us not be weary in well doing: for in due season we shall reap, if we faint not."
Luke 11:5 "And he said unto them, Which of you shall have a friend, and shall go unto him at midnight, and say unto him, Friend, lend me three loaves; 6 For a friend of mine in his journey is come to me, and I have nothing to set before him? 7 And he from within shall answer and say, Trouble me not: the door is now shut, and my children are with me in bed; I cannot rise and give thee. 8 I say unto you, Though he will not rise and give him, because he is his friend, yet because of his importunity he will rise and give him as many as he needeth. 9 And I say unto you, Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you. 10 For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened."
"Follow your impressions, begin humbly, and meek and lowly, and if you are repulsed, don’t say, I never will go there again, but go right to that very place again and perhaps they will have changed. The angels of God are working with every one that is working." {Ms119-1909.28}
"There are many things that persons may do if they only have a mind to work. There are many who will not go to church to hear the truth preached. By personal efforts in simplicity and wisdom these might be persuaded to turn their feet to the house of God. Conviction may fasten upon their minds the first time they hear a discourse upon present truth. Should your solicitations be refused, do not be discouraged. Persevere till success crowns your efforts." {RH June 10, 1880, par. 9}
"Many times our best efforts may seem to be disregarded and lost upon others, and we may be disappointed in the results; but this should not lead us to become weary in well doing, and indifferent to the woes of others. How often is Christ disappointed in his children, yet he has given them unmistakable evidences of his love. What if he had refused to bear our iniquity because he was rejected by many, and so few appreciated the infinite blessings he came to bring them? We need to encourage painstaking effort. We are in the world to do work for the Master. Why, then, should we become discouraged and give up when we do not see the immediate results we desire?" {SW August 25, 1908, par. 7}
We should not give up. At the very least we can pray for the person and ask that God would open the person to witnessing efforts. My wife used to be a Bible Worker and she was very persistent at going to visit contacts. Sometimes she could hear the people inside who were not coming to the door when she was knocking. But she would return. Eventually some of these people sought to know the Bible and eventually made decisions for Christ, etc.