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Let everything be done with a thankful heart and let resentment never be a part of your life.
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. Philippians 4:6
Let every thing that hath breath praise the LORD. Praise ye the LORD. Psalms 150:6

Resentment is always an expression of your dissatisfaction with God for what He has or has not given you in life.
3 John 1:9  ¶I wrote unto the church: but Diotrephes, who loveth to have the preeminence among them, receiveth us not.
10  Wherefore, if I come, I will remember his deeds which he doeth, prating against us with malicious words: and not content therewith, neither doth he himself receive the brethren, and forbiddeth them that would, and casteth them out of the church.

Do not think for even a moment that God is pleased with thanksgiving spoken with your lips while discontent reigns in your heart.
For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy, 2 Timothy 3:2
¶A merry heart maketh a cheerful countenance: but by sorrow of the heart the spirit is broken. Proverbs 15:13

God looks at the heart and with the heart you can please Him or displease Him.
A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things. Matthew 12:35

Malcontents are everywhere and into everything.
A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh. Luke 6:45

No matter how much God gives to them they complain, complain and complain.
2 Peter 2:17  These are wells without water, clouds that are carried with a tempest; to whom the mist of darkness is reserved for ever.
18  For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error.
19  While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage.
20  For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.

Never once are they ever thankful in their hearts for anything.
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies: Matthew 15:19

One that is not thankful for God's provisions will not receive any provision from God and even that what he has will be taken away.
Jude 1:11  Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core.
12  These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots;