Commentators emphasize the stark contrast between the destinies of God's followers and those who reject Him. One group experiences a deep 'joy of heart' that leads to singing. The other group faces a 'sorrow of heart' so profound it results in crying and a 'vexation' or 'breaking' of the spirit, as described by scholar Albert Barnes. This isn't just a difference in mood, but a fundamental difference in one's spiritual state.