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See also: Bushido - Code of the Samurai Warrior
勇士精神 can be translated as the warrior's spirit or warrior's soul. The first two characters can be translated as “warrior” or literally “brave soldier/man,” although some will translate this word as “hero.” Therefore, this is also how to say “heroic spirit.”
The second two characters mean vigor, vitality, drive, spirit, mind, heart, mental essence, and psychological component. Basically “your soul.”
We have two versions of this phrase. The only difference is the first two and last two characters are swapped. The version here suggests that you admire or like the idea of the spirit of a warrior. The other version suggests that you are the warrior or hero.