This is my second day on this text. 

Psalm 73:1 Truly God is good to Israel, To those who are pure in heart.
2 But as for me, my feet came close to stumbling, My steps had almost slipped. source

And I asked: as for me, my feet came close to stumbling, my step had almost slipped — why? Why had I come close to stumbling? Why had I almost slipped? 

Verse 3 For I was envious of the arrogant as I saw the prosperity of the wicked. source

Every time!
Envious!
Never good!
How does it happen?
Taking our focus from GOD and His goodness TO US onto people, especially people who seem to be doing all kinds of wickedness, will pollute our hearts and our feet will start slipping and sliding. Every time!