One of the most recognizable features of a Jewish home is the lighting of candles in honor of Shabbos. The above verse is the source of this concept. Ostensibly, it s hard to see the link between the manna, the miraculous food that the Jewish People ate in the desert, and the lighting of Shabbos candles.
Man is a relative animal.
Our perceptions operate in terms of contrast. We understand what day is because every evening the sky darkens and becomes black. If there were no night, not only would we have no concept of night, we would also have no concept of day. If every part of the world was bathed in constant sunlight, we would have no concept of what day is and no word for it. When the Children of Israel were in the desert, G-d fed them a miraculous food called manna.