nosce te ipsum
/ˌnɒsiː tiː ˈɪpsʌm/ /ˌnɒskeɪ teɪ ˈɪpsʊm/(also nosce teipsum)
noun
‘Know yourself’; the proverb ‘nosce te ipsum’ expressing this.
Origin
Early 16th century. From classical Latin nōsce tē ipsum know yourself, after ancient Greek γνῶθι σεαυτόν, a phrase inscribed at the shrine of Apollo at Delphi.