“Sometimes we grumble to ourselves out of habit. Maybe we have a more naturally pessimistic personality or we learned to do it. But whether it is habit, disposition, or upbringing that contributes to grumbling, the real root is selfishness.
Philippians 2:3 says ‘Do nothing out of selfish ambition or vain conceit, but in humility consider others better than yourself.’
“Complaining always reveals a lack of humility and plenty of self-centeredness…it shows our self-focus.”