Resistance is often a manifestation of homeostasis, the natural inclination of an organism to maintain its current condition.
Homeostasis regulates change.
For example, a thermostat is a homeostatic device for regulating temperature. Homeostasis takes place whether the change at hand is good or bad. In order to grow and change, we must learn how to recognize and work with the resistance which homeostasis generates. Realize that the intensity of your discomfort indicates the scale of the change, not its value. Be aware, too, that homeostatic resistance can crop up among your family, friends and coworkers as well as in yourself.