It's cross to bear, bear in this case being used in the same sense it is in weight bearing, Greeks bearing gifts or even ball bearing. It refers back to the Biblical tale of Jesus carrying his cross to Golgotha.
Lookin' Out My Back Door. Lookin' Out My Back Door is a song recorded by the American band Creedence Clearwater Revival, also known as CCR. The song was written by the band's lead singer, guitarist, and songwriter, John Fogerty.
For the song by Gene Autry, see Back in the Saddle Again.  Back in the Saddle  is a song by American hard rock band Aerosmith.It was written by Steven Tyler and Joe Perry. It is the first song on Aerosmith's pinnacle hard rock album Rocks released in 1976.Back in the Saddle  is a song by American hard rock band Aerosmith.