Final answer:
The quote means that the well-being of each person is interconnected with the well-being of everyone.
Step-by-step explanation:
The quote "The welfare of each of us is dependent fundamentally upon the welfare of all of us" means that the well-being of each person is interconnected with the well-being of everyone. It emphasizes the importance of collective welfare and suggests that individual welfare cannot be fully achieved if the welfare of others is neglected.