What is "to leave one to himself"

Himself \Him*self"\, pron.

1. An emphasized form of the third person masculine pronoun; -- used as a subject usually with he; as, he himself will bear the blame; used alone in the predicate, either in the nominative or objective case; as, it is himself who saved himself.

   But he himself returned from the quarries.
   --Judges iii. 19.

   David hid himself in the field.
   --1 Sam. xx. 24.

   The Lord himself shall give you a sign.
   --Is. vii. 14.

   Who gave himself for us, that he might . . . purify unto himself a peculiar people.
   --Titus ii. 14.

   With shame remembers, while himself was one Of the same herd, himself the same had done.
   --Denham.

   Note: Himself was formerly used instead of itself. See Note under Him.

   It comprehendeth in himself all good.
   --Chaucer.

2. One's true or real character; one's natural temper and disposition; the state of being in one's right or sane mind (after unconsciousness, passion, delirium, or abasement); as, the man has come to himself.

   By himself, alone; unaccompanied; apart; sequestered; as, he sits or studies by himself.

   To leave one to himself, to withdraw from him; to let him take his own course.