Psalms 73:26

My flesh and my heart faileth -Flesh and heart here seem to refer to the whole man, body and soul; and the idea is, that his powers of body and mind failed; were spent; were exhausted. This seems to have been said in an “ideal” sense, or by anticipation. He does not mean to say that his strength then had actually failed, but he seems to have placed himself by imagination in the situation where his strength “would” be all gone - in sickness, in weakness, in sorrow, on the bed of death.