Don’t say, “It’s been a good day” till sundown.
Don’t say, “She’s a good wife” till she’s buried.
Don’t say, “It’s a good sword” till you’ve tested it.
Don’t say, “She’s a good girl” till she’s married off.
Don’t say, “The ice is safe” till you’ve crossed it.
Don’t say, “The beer is good” till you’ve drunk the last of it.

From Hávamál, a Viking poem.