悔悟 is read as かいご (kaigo) and means remorse.
かいご
kaigo
ほんぜんかいご
to feel sudden remorse
くやしい
frustrated (over a failure, humiliation or injustice)
くやしなき
crying from vexation
くやしなみだ
tears of regret
かいしん
contrition
くいあらため
repentance
くいあらためる
to repent
くやみじょう
letter of condolence
かくご
readiness
たいご
enlightenment
けっしのかくご
readiness to die
てんめいかいご
casting away one's vices or worldly desires and achieving enlightenment