In his journal, he documented conversations between his different inner selves.

selves 是 self 的复数形式。self 指"自我、自己"，表示一个人内在的、本质的身份或个性。 inner selves 指一个人内心深处的不同面向或人格层面，可以理解为"内心自我"或"内在人格"。