What should the yogi have to fear? Trees, plants, and all that is inside and outside is he himself. So this is an idea that we get very clearly from the Upanishads. Any notion of duality, of me being different from you, or even one versus God, it's all an illusion. All is one. By the karma of past actions, the robe of this physical body is obtained. By his grace, the gate of liberation is found.