Verily I say, whatsoever ye have concealed within your hearts is to Us open and manifest as the day — Bahá’u’lláh
O Friends! Verily I say, whatsoever ye have concealed within your hearts is to Us open and manifest as the day; but that it is hidden is of Our grace and favor, and not of your deserving.

Bahá’u’lláh

The Hidden Words, Part Two (Persian), No. 60

Bahá’í Reference Library