have no heart for
Also, not have the heart for. Lack enthusiasm for, as in After the dog died he had no heart for taking long walks, or I should go through the family albums, but I don't have the heart for it. [Mid-1600s] Also see heart in it.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.