1Pe_2:9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
The light that ensues from God is the playing field of the person that is called. 1Jn_1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin. Darkness on the other hand, is the playing field of the devil. The two cannot mix and light is superior to darkness. In order for your calling to be light, you must be rid of darkness. That is, darkness of the mind, soul and spirit. Because you are chosen and called, faithfulness to the call is imperative in handling the call while remaining in the midst of darkness on earth. Darkness will increase upon the earth but so must light, within ourselves though it does not like it.