In other words, he is losing himself in the lives of others, and is finding his well-being, and therefore his happiness, in doing so.
But self-loss, with joy in the loss of self, is, in a word, love.
The path of self-realisation is, then, in its higher stages, a life of love.

He who walks in that path must needs lead a life of love.
He will love and serve his fellow-men, both as individuals and as members of this or that community, not because he is consciously trying to live up to a high ideal, but because he has reached a stage in his development beyond which he cannot develop himself except by leading a life of love, because the path of self-realisation has led him into the sunshine of love, and if he will not henceforth walk in that sunshine he will cease to follow his path.

He has indeed long walked in the foreglow of the sunshine of love.

The dawn of the orb of love is heralded by a gradual twilight, which lights the path of self-realisation, even in its earlier stages.

In Utopia the joy on the faces of the children is the joy of goodwill not less than of well-being.