5 And when thou prayest, thou shalt not be as the hypocrites are: for they love to pray standing in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have their reward.

6 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.

7 But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.

8 Be not ye therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him.

9 After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.

Psalm 55:17
17 Evening, and morning, and at noon, will I pray, and cry aloud: and he shall hear my voice.

Psalm 66:18
18 If I regard iniquity in my heart, the Lord will not hear me:

Romans 8:26-27
26 Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered.

27 And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God.

1 Thessalonians 5:16-19
16 Rejoice evermore.

17 Pray without ceasing.

18 In every thing give thanks: for this is the will of God in Christ Jesus concerning you.

19 Quench not the Spirit.