It has been said that people of the modern world suffer a great sadness, a "species loneliness"—estrangement from the rest of Creation. We have built this isolation with our fear, with our arrogance, and with our homes brightly lit against the night.

Solitude—the feeling and knowledge that one is alone, alienated from the world and oneself—is not an exclusively Mexican characteristic. All men, at some moment in their lives, feel themselves to be alone. And they are. To live is to be separated from what we were in order to approach what we are going to be in the mysterious future. Solitude is the profoundest fact of the human condition. Man is the only being who knows he is alone, and the only one who seeks out another. His nature—if that word can be used in reference to man, who has "invented" himself by saying "No" to nature—consists in his longing to realize himself in another. Man is nostalgia and a search for communion. Therefore, when he is aware of himself he is aware of his lack of another, that is, of his solitude.

we need solitude to thrive as human beings, and in recent years, without even realizing it, we’ve been systematically reducing this crucial ingredient from our lives. Simply put, humans are not wired to be constantly wired.

The great solitude of the individual is a hallmark of our times.

Examples similar to those given above are voluminous and point to a clear conclusion: regular doses of solitude, mixed in with our default mode of sociality, are necessary to flourish as a human being. It’s more urgent now than ever that we recognize this fact, because, as I’ll argue next, for the first time in human history solitude is starting to fade away altogether.

As Kethledge and Erwin explain, however, solitude is about what’s happening in your brain, not the environment around you. Accordingly, they define it to be a subjective state in which your mind is free from input from other minds.

Solitude in the city is about the lack of other people or rather their distance beyond a door or wall, but in remote places it isn’t an absence but the presence of something else, a kind of humming silence in which solitude seems as natural to your species as to any other, words strange rocks you may or may not turn over.

Philosophers call this state of isolation and disconnection “species loneliness” — a deep, unnamed sadness stemming from estrangement from the rest of Creation, from the loss of relationship. As our human dominance of the world has grown, we have become more isolated, more lonely when we can no longer call out to our neighbors. It’s no wonder that naming was the first job the Creator gave Nanabozho.

Many believe that they need company at any cost, and certainly if a thing is desired at any cost, it will be obtained at all costs. We need to remember and to teach our children that solitude can be a much-to-be-desired condition. Not only is it acceptable to be alone, at times it is positively to be wished for. It is in the interludes between being in company that we talk to ourselves. In the silence we listen to ourselves. Then we ask questions of ourselves. We describe ourselves, and in the quietude we may even hear the voice of God

Man ordinarily lives in loneliness. To avoid loneliness, he creates all kinds of relationships, friendships, organizations, political parties, religions and what not. But the basic thing is that he is very much afraid of being lonely. Loneliness is a black hole, a darkness, a frightening negative state almost like death … as if you are being swallowed by death itself. To avoid it, you run out and fall into anybody, just to hold somebody’s hand, to feel that you are not lonely… Nothing hurts more than loneliness.
But the trouble is, any relationship that arises out of the fear of being lonely is not going to be a blissful experience, because the other is also joining you out of fear. You both call it love. You are both deceiving yourself and the other. It is simply fear, and fear can never be the source of love. Only those who love are absolutely fearless; only those who love are able to be alone, joyously, whose need for the other has disappeared, who are sufficient unto themselves…

The day you decide that all these efforts are failures, that your loneliness has remained untouched by all your efforts, that is a great moment of understanding. Then only one thing remains: to see whether loneliness is such a thing that you should be afraid of, or if it is just your nature. Then rather than running out and away, you close your eyes and go in. Suddenly the night is over, and a new dawn … The loneliness transforms into aloneness.

Aloneness is your nature. You were born alone, you will die alone. And you are living alone without understanding it, without being fully aware of it. You misunderstand aloneness as loneliness; it is simply a misunderstanding. You are sufficient unto yourself.

Solitude is separate experience.

We live together, we act on, and react to, one another; but always and in all circumstances we are by ourselves. [...] By its very nature every embodied spirit is doomed to suffer and enjoy in solitude. Sensations, feelings, insights, fancies - all these are private and, except through symbols and at second hand, incommunicable.

Paradoxically, the ability to be alone is the condition for the ability to love.

True solitude is found in the wild places, where one is without human obligation. One’s inner voices become audible… In consequence, one responds more clearly to other lives.