The resistance to what is called the resistance. We simply don't allow things and humans to be and want them to suit our comforts and values. This is the actual resistance. Do you know that when you resist something, you prolong the experience?
If you just allow things to be or permit others to differ from you, you stop the resistance and when you do that, you stay clean from negative emotions like anger and envy, the two most futile emotions in the world.