What contentment is not opposed to
1. It is not opposed to a due sense of affliction. God gives His people leave to be sensible of what they suffer. Christ does not say, “Do not count as a cross what is a cross”; He says, “Take up your cross daily” (Luke 9:23).
2. It is not opposed to making in an orderly manner our moan to God and to our friends.
3. It is not opposed to all lawful seeking for help in different circumstances, or to endeavoring simply to be delivered out of present afflictions by the use of lawful means—it is but my duty. God is thus far mercifully indulgent to our weakness, and He will not take it ill at our hands if by earnest and importunate prayer we seek Him for deliverance until we know His good pleasure in the matter. Certainly seeking thus for help with such submission and holy resignation of spirit to be delivered when God wills, as God wills, and how God wills — this is not opposed to the quietness that God requires in a contented spirit.
— Jeremiah Burroughs
Christ Alone Wyoming 
Excellent topic and excellent book! Burroughs, Thomas Watson, and John Bunyan each wrote at length about this topic. So many people yank Phil 4:13 out of context and through it on their wall without stopping to think about what Paul was teaching.
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