Paul wrote that "we do not grieve as those who have no hope." By this, he means that we grieve as those who do have hope: we grieve - grieve is a necessary and inevitable part of the Christian life, as Jesus Himself tells us - but we grieve with hope.
The godless pagans and heathens grieve without hope. The Christians grieve with hope. Is there anyone who does not grieve at all? Only an idiot or a fool would believe that.
All the major people in the Bible grieved. We all grieve, sooner or later.