Are we sharing enough Truth?

In a given witness encounter that includes an individual who just does not agree, we can explain things until we are blue in the face, but if someone does not want to accept the Truth as Truth, there is not much more we can do. A good example of this is the parable of The Rich Man and Lazarus in Luke 16:19-31 which says the following:

19 "Now there was a rich man, and he habitually dressed in purple and fine linen, joyously living in splendor every day. 20 "And a poor man named Lazarus was laid at his gate, covered with sores, 21 and longing to be fed with the {crumbs} which were falling from the rich man's table; besides, even the dogs were coming and licking his sores. 22 "Now the poor man died and was carried away by the angels to Abraham's bosom; and the rich man also died and was buried. 23 "In Hades he lifted up his eyes, being in torment, and *saw Abraham far away and Lazarus in his bosom. 24 "And he cried out and said, 'Father Abraham, have mercy on me, and send Lazarus so that he may dip the tip of his finger in water and cool off my tongue, for I am in agony in this flame.' 25 "But Abraham said, 'Child, remember that during your life you received your good things, and likewise Lazarus bad things; but now he is being comforted here, and you are in agony. 26 'And besides all this, between us and you there is a great chasm fixed, so that those who wish to come over from here to you will not be able, and {that} none may cross over from there to us.' 27 "And he said, 'Then I beg you, father, that you send him to my father's house-- 28 for I have five brothers--in order that he may warn them, so that they will not also come to this place of torment.' 29 "But Abraham *said, 'They have Moses and the Prophets; let them hear them.' 30 "But he said, 'No, father Abraham, but if someone goes to them from the dead, they will repent!' 31 "But he said to him, 'If they do not listen to Moses and the Prophets, they will not be persuaded even if someone rises from the dead.' "

I always considered this to be a great example to those who do not believe the Truth and even have the audacity to say they will believe if only given a sign from God. Scripture tells us that even then they will not believe because they have not believed already the Word of God. What an incredible truth! This is why it is so important to continually pray for the lost. Otherwise, how should we expect them to hear the Truth with hearts of stone unprepared for the Word?