Philippians 4:4-8
Rejoice in the Lord always. I will say it again: Rejoice! 5 Let your gentleness be evident to all. The Lord is near. 6 Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. 7 And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus. 8 Finally, brothers and sisters, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy—think about such things.

The level of your effectiveness will be determined by the level of your joy.

5 Poisons that Kill Joy

1. Comparison
Don’t compare yourself with others. Just look at your own work to see if you have done anything to be proud of.  Gal 6:4-5

2. Conflict
Remind everyone about these things, and command them in God’s presence to stop fighting over words. Such arguments are useless, and they can ruin those who hear them.  2 Tim. 2:14

3. Concern
Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God.  Philippians 4:6

4. Control
And he is before all things, and in him, all things hold together.  Colossians 1:17

5. Complaining
Do everything without grumbling or arguing...  Philippians 2:14