Hesiod. Works and Days. (Lines 678-694).
Another time for men to go sailing is in spring when a man first sees leaves on the topmost shoot of a fig-tree as large as the foot-print that a cow makes; then the sea is passable, and this is the spring sailing time. For my part I do not praise it, for my heart does not like it. Such a sailing is snatched, and you will hardly avoid mischief. Yet in their ignorance men do even this, for wealth means life to poor mortals; but it is fearful to die among the waves. But I bid you consider all these things in your heart as I say. Do not put all your goods in hallow ships; leave the greater part behind, and put the lesser part on board; for it is a bad business to meet with disaster among the waves of the sea, as it is bad if you put too great a load on your waggon and break the axle, and your goods are spoiled. Observe due measure: and proportion is best in all things.