I will be the first to say that I hate darkness. I believe darkness is important because we need to rest, living things needs to rest, and it reminds us how much we appreciate daylight. But I thrive in the daylight, in the sunshine, in seeing the sun come up over the mountains.
However, a long time ago I learned that you can't impose your light on someone else when they need to be in darkness. It's not that they are planning to stay there long– we should know this from our own experience when something happens to us– it's about processing through what has happened.
When someone dies, when we learn disappointing news, when we feel defeated by life, or whatever it is, sometimes we need to stand in the darkness and mull it over before we can move forward with the journey.
When it happens to someone else, we should remember the same. They will move forward but in that moment they don't need to be reminded of all that they know. They know it, they just need a few moments to rest where they are. Let them be there, sit with them, and remember just because you're in their darkness doesn't mean you have to be stuck there. You're there for someone you care about, your light is still with you.
Soon they will pick back up again and head towards the light, tired of darkness and ready to move on. Then you can remind them of all that they have and how much you appreciate the light.