Croesus asked Solon if he thought him (Croesus) a happy man, arrayed as he was in his kingly best. According to Plutarch, as quoted in The Life of Greece, here's Solon's reply:
The gods, O King, have given the Greeks all other gifts in moderate degree; and so our wisdom, too, is a cheerful and a homely, not a noble and kingly, wisdom; and this, observing the numerous misfortunes that attend all conditions, forbids us to grow insolent upon present enjoyment, or to admire any man's happiness that may yet, in course of time, suffer change. For the uncertain future has yet to come, with every possible variety of fortune; and him only to whom the divinity has continued happiness unto the end do we call happy; to salute as happy one that is still in the midst of life and hazard we think as little safe and conclusive as to crown and proclaim as victorious the wrestler that is as yet in the ring.
The above reminded me of Shelley:
I met a traveller from an antique land
Who said: Two vast and trunkless legs of stone
Stand in the desert. Near them on the sand,
Half sunk, a shatter'd visage lies, whose frown
And wrinkled lip and sneer of cold command
Tell that its sculptor well those passions read
Which yet survive, stamp'd on these lifeless things,
The hand that mock'd them and the heart that fed.
And on the pedestal these words appear:
"My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!"
Nothing beside remains: round the decay
Of that colossal wreck, boundless and bare,
The lone and level sands stretch far away.