Matthew 6:34

Therefore, do not worry about tomorrow, for tomorrow will have enough to be worried about in itself. Each day has enough trouble of its own."

Romans 12:11-12

Be enthusiastic instead of lazy. Be fervent in your spirit [Note: Some translators take "spirit" here to refer to the "Holy Spirit"], [as you] serve the Lord.

Philippians 4:4-5

Rejoice in [fellowship with] the Lord all the time. I will say it again: Rejoice!

Treasury of Scripture Knowledge

Summary

Wherefore I perceive that there is nothing better, than that a man should rejoice in his own works; for that is his portion: for who shall bring him to see what shall be after him?

Bible References

Nothing

Romans 12:11
Be enthusiastic instead of lazy. Be fervent in your spirit [Note: Some translators take "spirit" here to refer to the "Holy Spirit"], [as you] serve the Lord.
Philippians 4:4
Rejoice in [fellowship with] the Lord all the time. I will say it again: Rejoice!

Who

Matthew 6:34
Therefore, do not worry about tomorrow, for tomorrow will have enough to be worried about in itself. Each day has enough trouble of its own."