"Reason, like beauty, is its own excuse
for being. It is useful, indeed, for living well, when to give reason
satisfaction is made the measure of good.The true philosopher, who is not one chiefly by
profession, must be prepared to tread the winepress alone. He may indeed
flourish like the bay-tree in a grateful environment, but more often he will
rather resemble a reed shaken by the wind."
George Santayana, The Life of Reason, Chapter 12
A few writers I keep coming back to, Santayan, William James, Spinoza, Plato. I'm not sure why. As classical philosophers go, Aristotle is as interesting as Plato, but I find Plato's company congenial, even though I find myself disagreeing with him more often than not.