Matthew.6:5-8
It is taken for granted that all who are disciples of Christ pray. You may as soon find a living man that does not breathe, as a living Christian that does not pray. If prayerless, then graceless. The Scribes and Pharisees were guilty of two great faults in prayer, vain-glory and vain repetitions. Verily they have their reward; if in so great a matter as is between us and God, when we are at prayer, we can look to so poor a thing as the praise of men, it is just that it should be all our reward. Yet there is not a secret, sudden breathing after God, but he observes it. It is called a reward, but it is of grace, not of debt; what merit can there be in begging? If he does not give his people what they ask, it is because he knows they do not need it, and that it is not for their good. So far is God from being wrought upon by the length or words of our prayers, that the most powerful intercessions are those which are made with groanings that cannot be uttered. Let us well study what is shown of the frame of mind in which our prayers should be offered, and learn daily from Christ how to pray.
Matthew Henry Commentary
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But when you pray, go into your room, close the door and pray to your Father, who is unseen. Then your Father, who sees what is done in secret, will reward you. Matt 6:6 Niv
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Matthew 26:36 Then Jesus came with them to a place called Gethsemane, and said to His disciples, "Sit here while I go over there and pray." Crross Reference
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Matthew 6:18 so that your fasting will not be noticed by men, but by your Father who is in secret; and your Father who sees what is done in secret will reward you.
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Acts 9:40 But Peter sent them all out and knelt down and prayed, and turning to the body, he said, "Tabitha, arise." And she opened her eyes, and when she saw Peter, she sat up.