Analysis:
This quatrain by Saadi Shirazi is a playful exploration of self-love and the desire for physical intimacy. Let's break down each line:

Line 1: چون صورت خویشتن در آیینه بدید

"When he saw his own face in the mirror,"
The speaker is describing a moment of self-reflection. They are looking at their own image.

Line 2: وان کام و دهان و لب و دندان لذیذ

"And those sweet lips, teeth, and tongue so dear, "
The speaker's attention is drawn to their own lips, teeth, and tongue. They find these features to be very attractive.

Line 3: می‌گفت چنانکه می‌توانست شنید

"He said, as loudly as he could,"
The speaker expresses their thoughts out loud, as if talking to themselves.

Line 4: بس جان به لب آمد که بدین لب نرسید

"Oh, how I've longed to kiss those lips!"
The speaker reveals a deep desire for physical intimacy, specifically a desire to kiss their own lips. This could be interpreted as a metaphor for a desire for something that is unattainable or for a sense of self-love.

Deeper Meaning:

This quatrain can be interpreted in several ways:

Self-love and vanity: On the surface level, the quatrain seems to be about vanity and self-love. The speaker is clearly admiring their own appearance.
A desire for intimacy: The speaker's desire to kiss their own lips could be a metaphor for a longing for physical intimacy, perhaps with another person.
The unattainable: The act of trying to kiss one's own reflection is inherently impossible. This could be a metaphor for the pursuit of something that is ultimately unattainable.

This quatrain is a playful exploration of human desires and limitations. It invites the reader to consider the nature of self-love, the pursuit of beauty, and the limits of human experience.