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Enter into My presence with thanksgiving and with grateful hearts offer your praise.
Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name. Psalms 100:4

In all things give thanks and in nothing shall you complain.
In every thing give thanks: for this is the will of God in Christ Jesus concerning you. 1 Thessalonians 5:18
¶O give thanks unto the LORD; for he is good: for his mercy endureth for ever. Psalms 136:1

Many complain and grumble day and night before My throne,
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened. Romans 1:21

2 Timothy 3:1  ¶This know also, that in the last days perilous times shall come.
2  For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy,
3  Without natural affection, trucebreakers, false accusers, incontinent, fierce, despisers of those that are good,
4  Traitors, heady, highminded, lovers of pleasures more than lovers of God;
5  Having a form of godliness, but denying the power thereof: from such turn away.

Saying; "why do you not answer my prayer, Lord?"
" Have I not served you?"
" Have I not done many things in your Name?"
Matthew 7:19  Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20  Wherefore by their fruits ye shall know them.
21  ¶Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22  Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23  And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.

Their prayers will not be answered nor do I know them that grumble.
But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house divided against a house falleth. Luke 11:17

Their thoughts are only upon themselves, and with themselves they are occupied.
I have spread out my hands all the day unto a rebellious people, which walketh in a way that was not good, after their own thoughts; Isaiah 65:2
The wicked, through the pride of his countenance, will not seek after God: God is not in all his thoughts. Psalms 10:4

Blessed is the man whose whole heart and mind is stayed on Me.
Blessed is the man whose strength is in thee; in whose heart are the ways of them. Psalms 84:5

His prayers I shall answer.
For the eyes of the Lord are over the righteous, and his ears are open unto their prayers: but the face of the Lord is against them that do evil. 1 Peter 3:12