When tempted to murmur against God, or begrudge him service, consider Ezekiel.
Consider the perseverence of Ezekiel. He was pushed to the limit by the LORD. Four times what the LORD requires of him seems too much. Four times he is brought to the position where he cries out for the LORD for mercy, for understanding...
1. On being told to cook with his own dung...
Eze 4:14 Then said I, Ah Lord GOD! behold, my soul hath not been polluted: for from my youth up even till now have I not eaten of that which dieth of itself, or is torn in pieces; neither came there abominable flesh into my mouth.
To which the answer is, "Okay, you can use cow dung instead whilst you lie on your side for over a year."
2. On being brought to watch the killing of the Jews in Jerusalem...
Eze 9:8 And it came to pass, while they were slaying them, and I was left, that I fell upon my face, and cried, and said, Ah Lord GOD! wilt thou destroy all the residue of Israel in thy pouring out of thy fury upon Jerusalem?
To which the answer is, "All who do not sigh and cry at the abominations committed in Jerusalem will die."
3. On being the prophet who foretells and witnesses the death of Pelatiah, a prince of Judah...
Eze 11:13 And it came to pass, when I prophesied, that Pelatiah the son of Benaiah died. Then fell I down upon my face, and cried with a loud voice, and said, Ah Lord GOD! wilt thou make a full end of the remnant of Israel?
To which the answer is, "No, a remnant will return - but the current destruction must run it's course."
4. On being ignored or not understood by the elders of his people...
Eze 20:49 Then said I, Ah Lord GOD! they say of me, Doth he not speak parables?
I.e. "they're not listening and they're not getting the message"
- To which the answer seems to be, "That's how it is; carry on speaking and being parables some more."
And yet through these trials Ezekiel perseveres in faithful service to the LORD.
And if those four incidents were not enough...
Eze 24:15-18 Also the word of the LORD came unto me, saying, Son of man, behold, I take away from thee the desire of thine eyes with a stroke: yet neither shalt thou mourn nor weep, neither shall thy tears run down. Forbear to cry, make no mourning for the dead, bind the tire of thine head upon thee, and put on thy shoes upon thy feet, and cover not thy lips, and eat not the bread of men. So I spake unto the people in the morning: and at even my wife died; and I did in the morning as I was commanded.
When you think you have a raw deal from the LORD, consider Ezekiel.