Matthew 6:34

Be not, therefore, anxious for the morrow; for the morrow will be anxious for itself. Sufficient for the day is its evil.

Romans 12:11-12

in diligence, not slothful; in spirit, fervent, serving the Lord;

Philippians 4:4-5

Rejoice in the Lord always; again I will say, 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
in diligence, not slothful; in spirit, fervent, serving the Lord;
Philippians 4:4
Rejoice in the Lord always; again I will say, rejoice.

Who

Matthew 6:34
Be not, therefore, anxious for the morrow; for the morrow will be anxious for itself. Sufficient for the day is its evil.