Love and sympathy are the activity of the idea. And in their exercise, the idea is enlarged. The lover widens his experience as the non-lover cannot. He adds to the mass of his idea-world, and acquires thereby enhanced power to appreciate all things. Is not this the sufficient solution of that long-standing difficulty between 'egoism and altruism?' The altruist alone can accumulate that treasure of idea through which all things must be enjoyed that are enjoyed. No one has, or can have, any 'egoistic' satisfaction except as a consequence of so much effective love of reality as there is in him by birth or acquisition.

Ch. XI : Idea in Organic Union with Feeling, p. 135 - The Meaning of God in Human Experience (1912)