Definition of nosce te ipsum in English:
nosce te ipsum
(also nosce teipsum)
nounˌnɒsiː tiː ˈɪpsʌmˌnɒskeɪ teɪ ˈɪpsʊm
‘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.