Thomas Campbell, a Scottish poet, said "To live in hearts we leave behind is not to die." Another quote is from British novelist, poet, and essayist C. S. Lewis. He said, "no one ever told me that grief felt so like fear."
A third sympathetic quote from American literary figure Thomas Bailey Aldrich says, "What is lovely never dies, but passes into other loveliness."
When supporting someone who is grieving, a helpful tip is to listen with compassion. Accept all feelings, and try not to say things such as "I know how you feel." Be willing to sit in silence, as well as let the grieving person talk about his loved one.