Who am I complain?

“Do everything without complaining and arguing, so that no one can criticize you.  Live clean and innocent lives as children of God, shining like bright lights in a world full of crooked and perverse people.” Philippians 2:14-15

This morning, while reading the day’s devotional, the above verses spoke to me in such a way that I can’t help but recall that when I was still working, even though I enjoyed doing my tasks, there were times that I felt resentment whenever I saw some of my co-workers laughing and doing nothing while I was deep with a heavy load of work.  I even secretly resented my supervisor for not giving assignments to these people who had been idle most of the time.  Is it because that whenever I was given tasks, I always did them immediately and not stop until they’re all done, while if the same tasks were given to others, it would seem that their hearts were not in their work, and because of that they just worked on them  half-heartedly, thus the tasks were not done as speedily as they should have been done?

Am I being judgmental by thinking this way?  And who am I to complain?  Isn’t it that as a Christian I am commanded to do everything without complaining?  “Whether therefore you eat or drink, or whatsoever you do, do all to the glory of God.” 1 Corinthians 10:31