G‑d did not give you light that you may hold it up in the middle of the day.
When you are given light it is in order to accomplish something, to do something difficult and novel.
Go take your light into the dark places and transform them that they may also shine!

The point of this fragment of the Rebbe. is that the life given to us is very short! We can't stay idle with the gifts and abilities we have been showered with by H' . Those abilities are light, and we would be selfish not to share them ASAP.- just by by being lazy. Sharing brings a community together, and that is also the point : so that everyone then participates searching for more light with THEIR own abilities. We are models for others. Then in tandem , we have then a bigger, shinier light light that can truly illuminate the world and make it better. GO for it !
Why do you think we need you to tell us in more words than needed, what the Rebbe means? We can all read as you do. We can all incorporate tte positivity, which is what the Rebbe, the Rebbes, back to the Baal Shem Tov, all of righteous memory, and Chabad, is about. Your comment reflects negativity in talking about "selfishness" that is not necessary. Everyone's journey, mission, is their own, in their own way, at their speed, without a need for that kind of "guilt".
Jf" beg your pardon. Discussing means " sharing one's own thoughts and try to make sense of what the Rebbe said to any one of us. So, like a good student, I reflect, and then I write. Sorry it is not making anyone feel guilty at all! it is called promoting ideas and ideals. Correct: "each on on their own pace! " As a teacher of Judaism and Jewish History, I don't work with guilt we have enough without my own prompting! JUST making people think-. since there is no way that my writing pushes somebody to do what they do not want. Finally, it is your choice to skip what I wrote. My main satisfaction is: that what I think i is being published most of the time, It makes me happy. If you don't like it just roll down to the next person, and in this way there is shalom bayit.