This is Ascension Sunday. The writer of Luke shows us an instance of uncertainty for the disciples as Jesus rises to heaven. They had been waiting for Jesus to restore the kingdom to Israel, but it appeared he was leaving them. In our current time we can identify with a deep desire for certainty because there is so much we don’t know. Jesus tells the disciples it is not for them to know times or periods, but they are to be his witnesses. What does that mean for us?