"Il fait tellement plus sombre quand une lumière s'éteint que cela n'aurait été si elle n'avait jamais brillé."

Simplified Meaning:

Imagine you are in a room that is completely dark; you can't see anything. Then, someone lights a candle, and suddenly you can see everything around you. Now, if the candle is blown out, the room feels even darker than before because you had gotten used to the light and what it showed you. This quote is saying that once you experience something wonderful, like a friendship or a happy time, losing it feels much worse than if you had never experienced it at all. For example, if you make a great friend and then you have a falling out, losing that friend hurts more because you knew how good it felt to have them in your life. This advice shows us how precious good times and relationships are. It teaches us to appreciate and cherish the positive moments and people in our lives. Even though losing them can be painful, it's a reminder of how valuable those good experiences were. So, it encourages us to make the most of the light - the good times - while we have them, even though their loss can feel so much more significant than if they had never happened.