From Ohr Avigdor Shaar Bitachon by Rabbi Avigdor Miller
Imagine a man who has learned to yearn for Hashem even in the middle of a crowd. So he goes to a wedding, and while everybody is making noise and singing and dancing, he’s thinking of Hashem as if he’s all alone. Now it won’t last long, but even for a minute it’s already something.
But while he’s doing all these things, he’s thinking of Hashem
It pays to learn about the higher levels even though we don’t have the ability to remain long in that state of mind. Although we’re not capable of understanding such people, we’ll imagine as follows. Let’s say a man at this highest level is invited by his son or by his brother to come to a wedding. What should he do? He will probably accept because it’s one of the obligations of a Jew to bring joy to the bride and groom, especially if they’re close to him. When he comes, is he going to avoid looking at anyone? No, he’ll smile to everyone; that’s his duty. He’ll say mazel tov to everyone, and he might even dance also.
But while he’s doing all these things, he’s thinking of Hashem. He’d like to be alone with Hashem. His desire to be alone with Hashem is not because he wishes to be in the World to Come with Hashem. Right now at this minute it’s more delightful for him to think about Hashem in the context of this wedding. Even if he never gets to the World to Come, right now he wants to enjoy the happiness of thinking about Hashem.