The Collaborative International Dictionary
To boast one's self
Boast \Boast\, v. t.
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To display in ostentatious language; to speak of with pride, vanity, or exultation, with a view to self-commendation; to extol.
Lest bad men should boast Their specious deeds.
--Milton. To display vaingloriously.
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To possess or have; as, to boast a name.
To boast one's self, to speak with unbecoming confidence in, and approval of, one's self; -- followed by of and the thing to which the boasting relates. [Archaic]
Boast not thyself of to-morrow.
--Prov. xxvii. 1