The saying is thought to have originated with Saint Bernard of Clairvaux who wrote (c. 1150), "L'enfer est plein de bonnes volontés ou désirs '' (hell is full of good wishes or desires). An earlier saying occurs in Virgil 's Aeneid: "facilis descensus Averno (the descent to hell is easy) ''.
who said road to hell is paved with good intentions
Saint Bernard of Clairvaux