Analysis:

This quatrain is a passionate expression of love and longing, mixed with a sense of forbidden desire and submission. Let's break down its meaning:

Metaphor of Fire: The image of the hand setting a haystack ablaze is a powerful metaphor for the intensity of the lover's passion. The beloved's touch is likened to a consuming fire.
Forbidden Love: The reference to the tattooed hand, which is "not lawful," suggests a love that is forbidden or socially unacceptable. This could be due to a class difference, a religious prohibition, or other societal constraints.
Submissiveness: Despite the pain and the forbidden nature of the love, the speaker is willing to endure it. The image of the tattooed hand around their neck symbolizes their submission to the beloved.

Themes:

Forbidden Love: The central theme is the pain and pleasure of forbidden love.
Passion: The speaker's love is intense and consuming.
Submissiveness: The speaker is willing to endure pain for the sake of their love.
Social Constraints: The love is hindered by societal norms and expectations.

Deeper Meaning:
This quatrain explores the complex emotions associated with forbidden love. The speaker's passion is both exhilarating and painful. The image of the tattooed hand, a permanent mark of their love, symbolizes the enduring nature of their feelings.

This quatrain is a powerful expression of the human heart, exploring the depths of love and desire, even in the face of societal constraints.