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Do not despair; but be of good cheer.
John:16:33 These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.

Let not your heart be troubled neither let it be afraid.
John:14:1 Let not your heart be troubled: ye believe in God, believe also in me.
John:14:27 Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid.

Walk always in the bright light of joy with a heart filled with rejoicing.
Deuteronomy:12:7 And there ye shall eat before the LORD your God, and ye shall rejoice in all that ye put your hand unto, ye and your households, wherein the LORD thy God hath blessed thee.

Never grumble nor complain; but in everything be grateful and give thanks.
Numbers:11:1 And [when] the people complained, it displeased the LORD: and the LORD heard [it]; and his anger was kindled; and the fire of the LORD burnt among them, and consumed [them that were] in the uttermost parts of the camp.
1Thessalonians:5:18 In every thing give thanks: for this is the will of God in Christ Jesus concerning you.

If there be any good thing, think on it.
Joshua:21:45 There failed not ought of any good thing which the LORD had spoken unto the house of Israel; all came to pass.

Focus your mind on the blessings God has showered upon your life and not on your rather trivial minor problems.
Ephesians:1:3 Blessed [be] the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly [places] in Christ:

Think of the faces of the good people in your life instead of thinking of the people who have done you wrong.
Philippians:4:8 Finally, brethren, whatsoever things are true, whatsoever things [are] honest, whatsoever things [are] just, whatsoever things [are] pure, whatsoever things [are] lovely, whatsoever things [are] of good report; if [there be] any virtue, and if [there be] any praise, think on these things.

Brethren, you may not always be able to control the circumstances that take place in your life; but you can always control what you think about.
Isaiah:26:3 Thou wilt keep [him] in perfect peace, [whose] mind [is] stayed [on thee]: because he trusteth in thee.

Rejoice always.
1Thessalonians:5:15 See that none render evil for evil unto any [man]; but ever follow that which is good, both among yourselves, and to all [men].
1Thessalonians:5:16 Rejoice evermore.

Amen.
Revelation:7:12 Saying, Amen: Blessing, and glory, and wisdom, and thanksgiving, and honour, and power, and might, [be] unto our God for ever and ever. Amen.