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"**Jai Hanuman Gyan Gun Sagar**" is the very first line of the **Hanuman Chalisa**, one of the most revered Hindu devotional hymns.

This opening line is a powerful invocation and translates to:

* **Jai Hanuman:** "Victory to Hanuman" or "Glory to Hanuman!" This is an exclamation of reverence and triumph.

* **Gyan Gun Sagar:** "Ocean of knowledge and virtues."

So, collectively, "Jai Hanuman Gyan Gun Sagar" means: **"Glory to Lord Hanuman, who is an ocean of knowledge and virtues."**

This line immediately sets the tone for the entire Chalisa, establishing Hanuman as the epitome of wisdom, noble qualities, and divine strength. It acknowledges his vast understanding, his perfect character, and his heroic deeds, inviting devotees to meditate on his greatness right from the beginning of the prayer.