Imam Jafar al-Sadiq:
Whoever sees that he has left from the darkness into the light, and is from the people of righteousness then he will leave from neediness [and go] into wealth / sufficiency. As for the light which is the day then it is interpreted by: right guidance. And the beginning of the day, is interpreted by: the beginning of the matter which he asks for. Its middle and last parts are compared against that.