Answer:
It comes only before, it comes only after. Rises only in darkness, but rises only in light. It is always the same, but is yet always different.
Is always in front of you but cannot be seen?
Nothing specific, but more than a few. This many clustered, together will do.
Blind but cruel.
What does a stone become when in the water?
Sometimes I am white, sometimes I am dark. Most people love me. What am I?