σὺ δὲ ὅταν προσεύχῃ, εἴσελθε εἰς τὸ ταμεῖόν σου καὶ κλείσας τὴν θύραν σου πρόσευξαι τῷ πατρί σου τῷ ἐν τῷ κρυπτῷ· καὶ ὁ πατήρ σου ὁ βλέπων ἐν τῷ κρυπτῷ ἀποδώσει σοι.

But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father who is in secret, and thy Father who seeth in secret, will reward thee openly.

Matthew 6:6