There is a Biblical illustration found in the book of Job.  After Job had lost his children, all his riches and his health, four friends came to visit him and comfort him.  The unusual part of the story is that they sat with Job for seven days a seven nights and did not say a word.   Though this may sound unusual, this was an ancient "Near Eastern" custom. 

I almost feel that this practice should be followed today.  Many times the things we say are more hurtful than helpful.  To be there as a friend, to assist in any way possible is the best answer.