We are connected.
One of my favourite books on personal development is Stephen Covey's The 7 Habits of Highly Effective People. He talks about three periods in human development; dependence, independence and inter dependence. These are stages in our lives and the expectation is that we move from depending on others, as children to mature beings who not only co exist but co operate for mutual benefit.
We know it doesn't always work that way. Some people continue to depend on others, even though they should be standing on their own two feet. Others in an adult relationship, choose to exhibit the behaviours of an independent lifestyle which invariably undermines the success of their union.
All that not with standing, there remains the pervading belief that we are all inter connected; related, sometimes inextricably. It echoes the quote by John Muir,'When One tugs at a single thing in Nature, he finds it attached to the rest of the world.'