Yeast and salt are contrary to each other, just like our flesh and spirit are contrary to each other (Galatians 5:17). Jesus warned about the yeast of the rulers, which is hypocrisy (Luke 12:1; Paul says the same in 1 Corinthians 5:6–8). Salt kills yeast; it deflates pride and exposes hypocrisy—two things that make us contrary to God and each other. Thus Jesus commanded us to have salt in ourselves, which means to be at peace with one another (Mark 9:50).