Desire is the source of suffering, but Zen can deflate your desires.
Desire can make us want things, even when we know we don't really want them!
Fear can debilitate our functioning, but Zen can help pull the mask off the things that scare you most.
We are a society of worriers, but worry is an unproductive expenditure of energy.
Once you determine your personal sources of dukkha (dukkha means suffering, or a deep feeling of discomfort and dissatisfaction), you can master your desires, fears, and worries with the regular practice of zazen (zazen means "sitting meditation") and a Zen attitude.