Jesus called you the light of this world, the salt of this earth; He said of the church body, "you are a city built upon a hill that cannot be hidden". If you examine the characteristic of light, salt and a city on a hill you realize that they cannot be easily covered up. Additionally light and salt change any environment that they are found in. This is what Jesus expects of you; that you will be a strong influence on your generation.
There is so much ability resident in you by virtue of your status as a child of God. These gifts and abilities were meant to be expressed for the benefit of your generation. You can limit the expression of these gifts and abilities by associating with the wrong people. You must guard that light that is inside you with diligence. Don't allow the darkness to overshadow the light in you.
The word communion used in 2 Cor 6:14 is from the Greek word koinonia which means deep friendship. While you are called to love your neighbors, you must ensure that you protect your destiny. You don't need friends or partners that will bring darkness into your life and hinder you on your path to fulfill your purpose. Make a commitment to associate rightly so that the light in you can be freely expressed.