Significantly, verses two to six of Matthew 6'1-13 are spoken as to an individual. Even though they make up the crowd, Jesus is addressing each one personally at this point. 

This is shown because He uses the Greek singular pronoun "you". Unlike English, the New Testament Greek language has both singular and plural words for "you".

As He focusses on them as individuals the Lord's personal directions of verses 2-5 climax with these assuring and powerful words:

"But you, when you pray, go into your room, and when you have shut your door, pray to your Father who is in the secret place; and your Father who sees in secret will reward you openly," Matthew 6'6.