Jesus told his disciples that he will return only once and that when he does, after a time of great tribulation, it will be visible to everyone and be followed by immediate and dire consequences for those unprepared and for those who were adversaries of God.
The followers of Jesus were convinced who he was and why his task given to them was so important. They continued bringing without letup teaching and declaring the good news about the Christ, Jesus, and asked their pupils and converted followers to do so too. Coming closer to the end times it is even more important because the world shall not be interested in God and many brought away from the Only One true God, by false preachers and mega churches.
Not many obey the Word of God and even fewer people are prepared to speak about it. Real Christians as followers of Jesus have to follow up the task given by Christ to go out into the world, preaching the Good News of the coming Kingdom of God.