The common good does not require that individuals suppress their individual interests, only that they adjust their actions so as to be compatible with and to promote the development of the capacities of others. In other words, individual growth means widening and expanding of one's horizons to include others and their concerns. Growth means deepening of character while extending and expanding the horizons of one's concern. The common good includes cooperation as promoting individual growth and enlargment and broadening of individual interests to include the interests of others. The big picture includes others.
Interdependence is a fact.
We are connected. Being connected, we can work together or work against one another. Since cooperation works better than conflict of energies, individual courses of action are best achieved when modified flexibly in the face of the movement of the energies of others. The flexibility of unique striving adapted to work together with the unique striving of others, so that both are moved forward rather than impeded, so that they are mutually reinforcing, is the unity within diversity sought in the light of the democratic ideal. Unlike the utilitarian ideal, it is objective rather than subjective.