Now fear the Lord and serve him with all faithfulness. Throw away the gods your ancestors worshipped beyond the Euphrates River and in Egypt, and serve the Lord. But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord. (Joshua 24:14-15)
As usual, the TARDIS has plopped the Doctor, Donna, and Martha down in the midst of significant events - in this case, a war between a group of humans and some aliens called the Hath. Part of the human contingent’s processing of the newcomers consists of taking a tissue sample from the Doctor. His DNA is then used to create a clone, in the form of a young woman (later dubbed “Jenny” by Donna) who is fully grown and already possesses the necessary military knowledge to join the other soldiers in the fight against the Hath.
At one point in the midst of all the running through corridors, Jenny prepares to stay behind and shoot at their pursuers in order to give the Doctor and Donna a chance to escape. The Doctor argues with her over her plan - despite the fact that she’s trying to protect them in what she sees as an “us or them” situation, he is vehemently against killing anyone. “We don’t have a choice,” Jenny tells him. “We always have a choice,” replies the Doctor.
Joshua had taken over leadership of the Israelites from Moses and had seen the people safely into the promised land and living prosperously for a number of years. He brought everyone together as his time in charge neared its end and reminded them that, in the words of the Doctor, “we always have a choice.” He laid out their story, enumerating all the things God had done for them, and declared that they should continue to worship this God that had brought them out of Egypt and through the wilderness and into such prosperity in this new land. But, he told them, they didn’t have to. They had a choice, and they needed to make a decision.
We still have a choice, and we are still asked to make a decision. So, whom will you serve this day?