This sermon speaks of the parable of the Mustard Seed and the parable of Yeast (or Leaven) in Matt 13. Although Christ doesn't specifically explain these 2 parable as He did the first 2, by looking elsewhere in scripture and understanding other spiritual concepts we can understand the personal application of these 2 parables in our lives. These 2 parables actually address the same thing, but from 2 different perspectives.