Here’s a thought:
On the very first Friday of history, Adam and Eve were created in the afternoon. On that first day, they were told not to eat from the fruit of one tree, the Tree of Knowledge, until nightfall.
The mystics teach us that the tree was a grape vine. Grapes are a fruit that contains the potential for abundant good and abundant evil. Over a glass of wine friendships are made and destroyed, lives are enhanced and ruined, hopes are created and dashed. It is the Tree of Knowledge of Good and Evil.
The prohibition was only to last until nightfall that day. Upon the start of Shabbos, they were allowed to eat from the fruit. However they did not wait.
We correct this mistake by making Kiddush on Friday night over wine or grape juice. It is to remind us that we can only have enjoyment of the pleasures of this world if we can also defer our enjoyment. If you can wait, then you are the master of your desires. If you can’t, then you are slave to them. The ability to control yourself is the key to being a good person. It starts with the way we eat, and extends to every choice we make. It elevates us above our base desires and empowers us to be masters over ourselves and reach out for a higher calling.
Menachem Mendel Bluming and Rabbi Moss taken from Shach al Hatorah, quoted in Likkutei Torah Kedoshim 29a