It is a waste of time to fish in a spot where the fish aren't biting. Wise fishermen move on. They understand that fish feed in different spots at different times of the day. Nor are they hungry all the time. This is the principle of receptivity...At certain times, unbelievers are more responsive to spiritual truths than at other times. This receptivity often lasts only briefly, which is why Jesus said to go where the people would listen. Take advantage of the responsive hearts that the Holy Spirit prepares. Notice Jesus' instructions in Matthew 10:14 (NCV): 'If a home or town refuses to welcome you or listen to you, leave that place...' This is a very significant statement that we shouldn't ignore. Jesus told the disciples they were not supposed to stay around unresponsive people. We aren't supposed to pick green fruit, but to find the ripe fruit and harvest it.
– Rick Warren