It may be said that this is the precise point at which we are invoking the impossible. Man's capacity, it may seem is confined to giving his affection to one human being or to very few. Beyond that radius the heart does not carry, and there is only room for cold justice and cold reason. To love all and everyone is a contradictory and false gesture which only leads in the end to loving no-one.
To that I would answer that if, as you claim, a universal love is impossible, how can we account for the irresistible instinct in our hearts which leads us toward unity whenever and in whatever direction our passions are stirred? A sense of the universe, a sense of the all, the nostalgia which seizes us when confronted by nature, beauty, music - these seem to be an expectation and awareness of a Great Presence. The "mystics" and their commentators apart, how has psychology been able so consistently to ignore this fundamental vibration whose ring can be heard by every practised ear at the basis, or rather at the summit, of every great emotion? Resonance to the All - the keynote of pure poetry and pure religion. Once again: what does this phenomenon, which is born with thought and grows with it, reveal if not a deep accord between two realities which seek each other the severed particle which trembles at the approach of "the rest"?
We are often inclined to think that we have exhausted the various natural forms of love with a man's love for his wife, his children, his friends and to a certain extent his country. Yet precisely the most fundamental form of passion is missing from this list, the one which, under the pressure of an involuting universe, precipitates the elements one upon the other in the Whole - cosmic affinity and hense cosmic sense. A universal love is not only psychologically possible; it is the only complete and final way in which we are able to love." - Pierre Teilhard de Chardin