Count One's Blessings Meaning

Example : 1915, Eleanor H. Porter, Pollyanna Grows Up, ch. 3:  Of course if she begins to preach, and to tell me to count my blessings, I shall send her away.1995, Richard Lacayo et al., "Bart Simpson Calling," Time, 22 May:  Rupert Murdoch isn't somebody to sit back and count his blessings.2006, Mark Winegardner, The Godfather's Revenge, ISBN 9780399153846, p. 175:  The other out-of-town Dons patiently listened, perhaps counting their blessings that each had a city all to himself.