Three short scenes show how the speaker behaves in three different settings, and the tone shifts as they go. In the letter, the speaker follows the flow of language and then lingers in it, talking for the sake of talking. There is a hint of being carried along by words, perhaps further than intended.
The love section is the sharpest. Varnishing a crucifix suggests polishing something sacred until it shines, then calling the result love. The speaker seems to be admitting that tenderness can turn into decoration or performance, a surface that looks like devotion.
The garden brings relief. "I am of the garden" has no gap between person and place, and the speaker simply returns home. After the slight unease of the first two scenes, this one feels settled and honest. The mood is quiet and self-aware, a little wry, and it ends in calm. Judging by the contrast, the poem suggests that nature allows a wholeness that language and love sometimes don't.