One’s “face is the mirror of” his “heart”

Thou hast forwarded thy photograph and it was considered. In thy face a brilliant light is apparent and that sparkling light is the love of God. All faces are dark except the face which is a mirror of the light of the love of divinity. This light is not accidental -- it is eternal. It is not temporal but real. When the heart hath become clear and pure then the face will become illuminated, because the face is the mirror of the heart. (‘Abdu'l-Baha, Tablets of Abdu'l-Baha v2, p. 244)