Read Matthew 6:6 Using Other Translations
But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.
But when you pray, go into your room and shut the door and pray to your Father who is in secret. And your Father who sees in secret will reward you.
But when you pray, go away by yourself, shut the door behind you, and pray to your Father in private. Then your Father, who sees everything, will reward you.