Poseidon has three main aspects: sea-god, earth-shaker, and giver of horses. As sea-god he could stir up the waves or calm them, while as the earth-shaker his power was terrifying. Only as the god of horses was Poseidon a clear friend to humans.
The Norse sun-goddess, far from being some sort of Northern aberration, is very similar to other Indo-European sun deities. This shouldn’t come as a surprise, since “basic” deities like the sky, earth and rivers tend to keep their characteristics across a very wide swathe of Europe and Asia.
The philosopher Plato recorded the last words of his mentor, Socrates, in a dialogue called the Phaedo. According to him, Socrates tried to console his followers by contrasting the nightingale and the swan. In myth the nightingale sang for sorrow, while swans only sang once, at their death. Socrates argued that swans sang because, as Apollo’s birds, they could foresee the joys of the afterworld.