Based on yudhistra'sreply :The fastest is

According to Yudhishthira's response in the Yaksha prashna episode, the mind is faster than the heart. This philosophical question posed by the Yaksha tested Yudhishthira's wisdom, where he had to identify what was fastest among various elements. The answer emphasizes the mind's capacity to instantaneously travel anywhere, surpassing even physical objects like Rama's arrow or Krishna's discus in speed.