In life there is joy and grief, love and sorrow, night and day, man and woman.  We must bear our suffering but that will not make it joyful.  Joy and suffering are two sides of the same coin.  When we must suffer, it is the time that the strong ego part of us grows or not.  I do not know and neither does anyone know what Jesus sang, said or did on the way to Calvary, this is a misconception that many people use.  It in fact, is sadistic to think we must sing joyfully while we suffer; NO we must bear it and move on.  BTW, the type of ideas that RD shows in this section comes from the close ties between sadism and masochism. While we are suffering, physical or emotional pain, it is indeed very hard to rejoice, the author indeed has it right, it is faith in our God and the presence of God in each of us that allows us to have great growth during our necessary but fearful times of suffering.  It is not the joy of suffering itself--- that is pure masochism.