In your light I learn how to love. In your beauty, how to make poems. You dance inside my chest where no-one sees you, but sometimes I do, and that sight becomes this art.

This quote is saying that the speaker has been inspired by someone else’s beauty and light and it has helped them learn to love, and also inspired them to write poetry. This person has become a part of them and lives inside of the speaker’s chest even though nobody else can see it. But sometimes the speaker can see the person inside themselves and this sight has become art which the speaker has created.