至誠 is the idea that you enter into something with the utmost sincerity and fidelity. Ideas such as devotion, honesty, and “one's true heart” are also contained in this word.

至誠 is a universal word as the Chinese, Japanese Kanji, and Korean Hanja are all identical.

When you take 血心 apart, you find the sum is slightly different than the parts. The first character means blood, and the second means heart. It is important to note that for thousands of years, it was believed that your heart was both your soul and your mind in Asian culture. When you add blood to the heart, it is your whole being - the pure and clean dedication of your whole soul.

Most Chinese dictionaries define this as the sincerity of heart or a MEDICAL TERM!!!
Please think carefully before ordering this selection - it was only added as others have used this for coffee cups and other novelties (though perhaps naively).

While 真心 literally reads as “true heart” or “genuine heart,” the understood meaning is sincerity, devotion, sincere, or heartfelt. Some will extend the meaning to be like “true love.” It's the idea of doing something or treating someone with genuine feelings.

真心 is valid and has the same meaning in both Chinese characters and Japanese Kanji.

Note: While not too common, this can be the female given name “Mami” in Japanese.