Addressing the OP only. you said this,
is this by mouth or heart?
according to what i know written heart is equal to mind/brain because i always pray in my head because i am shy but straightforward i might be doing the wrong thing so i am asking
so you always pray, (I'm assuming that you're saved), or... even want to ... that's good. God answeres all prayers, (saved or not). even if you like the answer he gives or not. but here's my point and maybe it might answer your concerns.
when I was first saved, I use to pray, especially when I confess my sins to God, according to 1John 1:9. but before I got up off my knees the devil would bring up something else up in my mind I might had forgot to confess, then feeling God had not heard my prayers, still having the filthy stain of sin. well God broke that yoke, because we're saved and has been washed, for we should not "FEEL" that we're save, but have confidant in "KNOWING" that we're saved. that made a difference in when I pray to God.
now as for speaking or praying in one's heart. I reminded of Hannah in the bible, listen,
1 Samuel 1:9 "So Hannah rose up after they had eaten in Shiloh, and after they had drunk. Now Eli the priest sat upon a seat by a post of the temple of the LORD.
1 Samuel 1:10 "And she was in bitterness of soul,
and prayed unto the LORD, and wept sore.
1 Samuel 1:11 "And she vowed a vow, and said, O LORD of hosts, if thou wilt indeed look on the affliction of thine handmaid, and remember me, and not forget thine handmaid, but wilt give unto thine handmaid a man child, then I will give him unto the LORD all the days of his life, and there shall no razor come upon his head.
1 Samuel 1:12 "And it came to pass,
as she continued praying before the LORD, that Eli marked her mouth.
1 Samuel 1:13 "Now Hannah,
she spake in her heart; only her lips moved, but her voice was not heard: therefore Eli thought she had been drunken.
1 Samuel 1:14 "And Eli said unto her, How long wilt thou be drunken? put away thy wine from thee.
1 Samuel 1:15 "And Hannah answered and said, No, my lord, I am a woman of a sorrowful spirit: I have drunk neither wine nor strong drink,
but have poured out my soul before the LORD.
1 Samuel 1:16 "Count not thine handmaid for a daughter of Belial: for out of the abundance of my complaint and grief have I spoken hitherto.
1 Samuel 1:17 "Then Eli answered and said,
Go in peace: and the God of Israel grant thee thy petition that thou hast asked of him.
1 Samuel 1:18 "And she said, Let thine handmaid find grace in thy sight. So the woman went her way, and did eat, and her countenance was no more sad.
so when one is in "Faith", ask, in heart, or in mouth, God will hear.
Hoped that helped.
PICJAG.