I have got the lines mixed up

I crossed the Pennine Hills as cold as glass
Not knowing of the death of Sylvia Plath,
Fall in love but do not lose your wits
Do not rush like swine into the muck
Find a truer path with love and luck
Time enough to wait till you are wed
Do no be in haste to go to bed
The Cuban Missile Crisis made us fear
The end of all the world was much too near.
Sylvia lost her life yet I am here
Her baby grabbed at women with long hair