Analysis:

This quatrain by Saadi Shirazi is a beautiful example of using nature to convey a deeper human message. Let's break down the lines:

Line 1: آهو بره را که شیر در پی باشد

"The lamb, whose mother is being chased by a lion,"
This line sets the scene of a vulnerable lamb whose mother is in danger.

Line 2: بیچاره چه اعتماد بر وی باشد؟

"Poor thing, what trust can it have in her?"
The lamb, being young and innocent, naturally trusts its mother. However, the situation they're in forces the lamb to question this trust.

Line 3: این ملح در آب چند بتواند بود؟

"How long can this salt remain in water?"
This line compares the temporary nature of the lamb's trust to the dissolution of salt in water.

Line 4: وین برف در آفتاب تا کی باشد؟

"And how long can this snow last in the sun?"
This line further emphasizes the fleeting nature of certain situations and emotions.

Deeper Meaning:

This quatrain suggests that:

Trust can be broken: Even the strongest bonds of trust can be shattered by circumstances.
Nothing lasts forever: All things, even the most beautiful and enduring, are subject to change and decay.
The impermanence of life: Life is full of uncertainties and challenges, and it's important to be prepared for change.

This quatrain is a reminder of the impermanence of life and the fragility of trust. It suggests that we should cherish the moments we have and be prepared for life's inevitable changes.

A metaphorical interpretation: The lamb can represent innocence or naivety, while the lion can symbolize danger or adversity. The salt dissolving in water and the snow melting in the sun can represent the fleeting nature of joy, hope, or even life itself.