Will of Fire (Earth-2356)

The Will of Fire is an ancient Jedi  belief in the Living Force that love is the key to peace. It would eventually become the life philosophy which the Jedi Order lived by, which had since been passed on to many Jedi as a part of their spiritual heritage.

It states that all living beings are a large family unit and every sentient being with the Will of Fire loves, believes, cherishes, and fights to protect their loved ones, as previous generations had done before them. In Coruscant, near the Jedi Temple, there was a sculpture of a flame in the cemetery representing this will.

According to Jedi Master Yoda, this was what gave the Jedi strength to continue fighting against all odds, building willpower and strength of character. It was also symbolic of the hopes and dreams of the previous generation being passed to the next; for example, when Jedi Master Asuma Sarutobi was killed, his hopes and dreams were passed to Shikamaru Nara, who asked that Asuma's will would in turn be passed on to his and Kurenai's child.

Source

 * https://naruto.fandom.com/wiki/Will_of_Fire.