690. The baptism performed by John represented the cleansing of the external man; but baptism as practised among Christians at the present time represents the cleansing of the internal man, which is his regeneration. That is why we read that John baptised with water, but the Lord baptises with the Holy Spirit and with fire. So too John's baptism is called a baptism of repentance (Matthew 3:11; Mark 1:4ff; Luke 3:3, 16; John 1:25-26, 33; Acts of the Apostles 1:22; 10:37; 18:25). The Jews who were baptised were nothing but external men, and the external man cannot become internal without faith in Christ. It may be seen in the Acts of the Apostles (Acts of the Apostles 19:3-6) that those who received John's baptism became internal men, when they accepted faith in Christ and were then baptised in the name of Jesus.

A "field" in the Bible usually represents the Lord's church, and more specifically the desire for good within the church. It's where good things start, take root, and grow. When you have a desire to be a good person and to do good things, the natural first questions are "What does that mean?", "What should I do?", "What can I do?". You look for ideas, concepts, direction. Once you figure out something you want to do or a change you want to make in yourself, you seek specific knowledge. If you want to volunteer at a food pantry, say, you'd need to know whom to call, when they need help, where to go, what to bring. Armed with that knowhow, you're ready to get to work. That process could be compared to food production. You start with a field -- which is that desire to be good. Then you plant seeds -- those ideas and concepts. Those seeds sprout into plants -- the specific facts and knowledge needed for the task (easily seen in the food pantry example, but also true with deeper tasks like "being more tolerant of my co-workers" or "taking more time for prayer," or "consciously being a more loving spouse"). Finally, those plants produce food -- the actual good thing that you go and do. The Writings also say that in a number of cases a "field" represents the doctrine, or teachings, of the church. This sounds markedly different. The desire for good is emotional, a drive, a wanting; doctrine is a set of ideas. But for a church to be true, its doctrine must be centered on a desire for good, and must lead people toward doing what is good. So sound doctrine is actually closely bound up with the desire for good.