
1960s, Where Do We Go from Here: Chaos or Community? (1967)
Variant: A man can't ride your back unless it's bent.
1960s, Where Do We Go from Here: Chaos or Community? (1967)
Source: A Neglected Argument for the Reality of God (1908), IV
“There cannot be Ups in a roller-coaster ride unless there are Downs.”
page 9
Dark Rooms (2002)
“You can't make a man a Christian unless you first make him believe he is a sinner.”
Lin Yutang, The Importance of Living (1937), p. 17
Misattributed
“Trust no one at your back unless you want them to bury a knife in it.’ (Syn)”
Source: Born of Fire
“You can't ride two horses with one behind.”
"Tunnel of Love"
Song lyrics, Tunnel Of Love (1987)