In Luke 21:1-15, Jesus teaches his disciples about the importance of giving generously and sacrificially, even when it may seem difficult or inconvenient. He also warns them about the coming destruction of the temple in Jerusalem and the signs of the end times. Jesus encourages his followers to remain faithful and not be deceived by false prophets or signs, but to trust in God's protection and provision. He also reassures them that they will have the opportunity to testify about their faith and that the Holy Spirit will give them the words to speak. Ultimately, Jesus emphasizes the importance of staying faithful and trusting in God's plan, even in the midst of difficult circumstances.