Understanding why we should be content is just as important as being content. Contentment for the Christian believer produces something that has eternal value. Biblically based contentment also prepares the believer to deal with spiritual choices that we make all the time whether we realize it or not.
If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness; He is proud, knowing nothing, but doting about questions and strifes of words, whereof cometh envy, strife, railings, evil surmisings, Perverse disputings of men of corrupt minds, and destitute of the truth, supposing that gain is godliness: from such withdraw thyself. But godliness with contentment is great gain. For we brought nothing into this world, and it is certain we can carry nothing out. And having food and raiment let us be therewith content. But they that will be rich fall into temptation and a snare, and into many foolish and hurtful lusts, which drown men in destruction and perdition. For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows. But thou, O man of God, flee these things; and follow after righteousness, godliness, faith, love, patience, meekness. (1 Tim. 6:3-11)
But I rejoiced in the Lord greatly, that now at the last your care of me hath flourished again; wherein ye were also careful, but ye lacked opportunity. Not that I speak in respect of want: for I have learned, in whatsoever state I am, therewith to be content. I know both how to be abased, and I know how to abound: every where and in all things I am instructed both to be full and to be hungry, both to abound and to suffer need. I can do all things through Christ which strengtheneth me. Notwithstanding ye have well done, that ye did communicate with my affliction. (Phillipians. 4:10-14)
Let your conversation be without covetousness; and be content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee. So that we may boldly say, The Lord is my helper, and I will not fear what man shall do unto me. (Hebrews 13:5-6)
Contentment is one of the most important character traits that the fruits of the Spirit develope in us, cf. Gal. 5:22-23.
When we find contentment generously displayed through our Christian walk we begin to experience the deep mystery of the gift of Faith, Hope, & Love planting our feet on solid ground allowing us to say the same as Paul did in Romans 8:37-39.
Nay, in all these things we are more than conquerors through him that loved us. For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord. (Romans 8:37-39)
Contentment is the basis of a victorious life in Christ. Without it we have actually not fully come to the place where we can trust Him. Contentment prepares us to not yield to our lusts.
Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him. For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever. (1John 2:15-17)
Doing, and being, in the will of God always produces the fullness of contentment. I struggle with this more than I like, yet Ephesians 4:16-21 encourages me, as I hope it will you.