Nietzsche, the honorary name 'love'

We slowly grow tired of the old, of what we safely possess, and we stretch out our hands again; even the most beautiful landscape is no longer sure of our love after we have lived in it for three months, and some more distant coast excites our greed; possession usually diminishes the possession.

...

Here and there on earth there is probably a kind of continuation of love in which this greedy desire of two people for each other gives way to a new desire and greed, a shared higher thirst for an ideal above them. But who knows such love? Who has experienced it? Its true name is friendship.

The Gay Science, 14