We are created to pursue our best interest. It is an unalterable instinct in humanity to seek what is best for itself.
The problem arises when we start to think the best for ourselves is in direct opposition of the best for others. We start to value wealth for its own good, as a measure of our worth over and against others and their bank accounts. It is a trap. One in which we stick a foot in with earnestness, seeking our best self-interest, but get snared and caught believing that what feels best or what can be counted (money, possessions, etc.) are the ultimate manifestations of that self-interest.
In reality, the best for us is also the best for others. It is a communal self-interest wherein each participant finds his or her own best self-interest.
This is the practice of righteousness, godliness in community, toward a social harmony. Our desire for our own best plunges us into destruction when we set it up as an opposing force to the good of community. When we align it with the good of our community (the good of others), it invites contentment, peace, and joy.
Everything we have – money, resources, etc. – is not the source of our gain. It is a resource to help us achieve our true gain, which is contentment and participation in the Body of Christ.