Do not drink intoxicating wine, you and your sons with you, when you enter the Tent of Meeting, lest you die: it shall be a statute forever throughout your generations (Vayikra 10:9)

Chazal use a parable to explain how we know why Aharon’s sons were killed: A king observed that his watchman had unlocked the door of the royal treasury, so he had him executed. When the king appointed a new watchman, he gave him one clear instruction: “Never unlock the door to the king’s treasury.” From this we understand clearly that the first watchman was killed because he unlocked the door to the treasury.

So too with Aharon’s sons. Immediately following their death, the Torah explicitly commands Aharon that he and his sons should not drink intoxicating beverages before performing the service. From this we know that this must have been the reason for their death.

This raises a question: if Aharon’s sons were visibly intoxicated to the point that they were acting improperly, we would have automatically understood why they were punished. The fact that the Torah needs to teach us the reason implies that they had not drunk too much. Rather, they had imbibed just enough to be technically above the “legal limit.” If so, why was this such a grave sin that they lost their lives?

Chazal speak positively about drinking wine in many situations. They even encourage it on Yom Tov and Purim, explaining that wine can help us serve Hashem with simcha. In those settings, drinking is viewed as a constructive tool that elevates our avodah. Why then is wine regarded here in such a negative light?

I believe the answer lies in the unique nature of the service in the Beis Hamikdash. Imagine two couples celebrating their wedding anniversary. The first couple enhances the occasion with “props” –a gift, a bottle of wine, an elegant restaurant, etc. – to please each other. The second couple simply spends quiet, meaningful time together, without any props. Which couple would you say has the stronger marriage? It seems clear that if a couple needs props to impress each other, it may indicate that the relationship lacks the necessary luster. The couple who can celebrate simply by being together probably has the stronger marriage.

The same principle applies to the avodah in the Beis Hamikdash. When we are truly serving Hashem, the mitzvah itself should be enough. If a person feels he needs something additional – like wine – to do it with simcha, it shows that he lacks a full appreciation of the value of the service in the Beis Hamikdash. Therefore, even a small amount of wine, though it may promote a good mood, becomes inappropriate in that context.

On Yom Tov and Purim, however, the goal is to create our own personal happiness, therefore wine is a legitimate aid in reaching that state.

Similarly, if someone needs to get intoxicated to rejoice at another person’s simcha, it suggests that he isn’t truly connected to the baal simcha or the simcha itself. One who is genuinely happy for someone else does not need external stimuli.

In general, in our service to Hashem, unless told otherwise, we should live by the words of the verse: “Ivdu es Hashem b’simcha” – “serve Hashem with happiness”. We should be celebrating the privilege of our special relationship with Hashem via the mitzvah itself, without needing anything extra to awaken that joy.