In elementary school, when children learn about plants they inevitably plant a small seed in a clear plastic cup and watch it grow. This helps as they learn the parts of plants: leaf, stem, roots. As we get older we get more sophisticated in our ability to explain the details of the plant and the growth we see, but on some level the growth itself remains a mystery. Why do some plants thrive and others fail? Was it the soil? Too much water? Too little? And what of those plants growing in the tiny cracks in between slabs of concrete?
The growth of faith is a similar mystery. We can do the best we can to provide good soil, in the form of teachers and mentors, parents and pastors. Still, the faith seems to take root and grow in some people and not in others. And then there are people raised in the worst conditions who grow to be strong people of faith.
Jesus reminds us that faith is a gift which comes to us from God. We cannot control it in ourselves, and we cannot control it in others. We can plant, we can water, and then we can sleep and wake until the plant grows. In the end it is God who brings the growth and the Holy Spirit who gives us faith. As people of God we are called to be good soil. As people of God we are called to trust that God will do what we cannot. Faith will grow, and the church will flourish, not because of our grand schemes and plans, but because God will have it no other way.