He points to sorrow, but only as a process which sin has rendered necessary. Where self ends grief passes away. Joy is the companion of righteousness. In the divine life tender compassion fills the place where weeping sorrow sat. During the process of becoming unselfish there are periods of deep sorrow.
Purification is necessarily severe.
All becoming is painful. Acts, feelings, thoughts, conditions, qualities. The good, the pure, are the superlatively happy. However men may argumentatively deny or qualify this, humanity instinctively knows it to be true. We look almost in vain for any expressions of sorrow in the words of Jesus.