According to Osho, negativity surfaces first in catharsis because it forms the upper crust of our karmic layers—like stones and rubbish encountered before reaching water when digging a well. Love, joy, and compassion lie deeper. Empty the repressed anger, jealousy, and sorrow completely; then their polarities—compassion, nonviolence, and bliss—arise naturally. Persist with continuous effort and awareness, without refilling the well through daily unconsciousness.
The nice feelings are deeper inside you, so when you start cleaning, the dirt on top (anger, hurt) comes out first, and once that’s cleared, love and joy flow by themselves.