Analysis:

This quatrain by Saadi Shirazi is a beautiful expression of romantic love and joy. Let's break down each line:

Line 1: امشب که حضور یار جان افروزست

"Tonight, with my beloved's soul-kindling presence"
The speaker is expressing their joy and excitement at being in the presence of their beloved. The phrase "جان افروز" (soul-kindling) emphasizes the intense emotional connection and the life-giving nature of their love.

Line 2: بختم به خلاف دشمنان پیروزست

"My fortune triumphs over my enemies"
Here, the speaker expresses a sense of triumph and victory. They feel that their love for their beloved is so powerful that it has overcome any obstacles or enemies they may have faced.

Line 3: گو شمع بمیر و مه فرو شو که مرا

"Let the candle die and the moon fade, for me"
This line is a poetic exaggeration that highlights the speaker's contentment. They are so happy in the company of their beloved that they don't need the light of the candle or the moon. Their beloved's presence is enough to illuminate their world.

Line 4: آن شب که تو در کنار باشی روزست

"The night when you are beside me is day"
This line further emphasizes the transformative power of love. The speaker is saying that when they are with their beloved, even the darkest night becomes as bright as day.

Themes explored in the quatrain:

The power of love: Love is depicted as a powerful force that can overcome any obstacle and bring great joy.
The transformative nature of love: Love can change one's perspective and make even the darkest moments seem bright.
The importance of companionship: The speaker values the companionship of their beloved above all else.

This quatrain is a celebration of love and the happiness it brings. It captures the universal experience of feeling loved and cherished.