The command to arise, to let your light shine is a call through the Gospel, which germinates the the seed of faith planted in the hearts of the believer. The water, washing, and entrance of the word, all comes through that word which was made flesh that lighted every man that comes to Him for life. The word comes in its fullness to the believers to give them life more abundantly, it causes the growth, by our exercise of use. As we do it becomes brighter within us changing our outward countenance so that Christ shines through.