George Macdonald said this quote

He had the fault of thinking too well of himself--which who has not who thinks of himself at all, apart from his relation to the holy force of life, within yet beyond him? It was the almost unconscious, assuredly the undetected, self-approbation of the ordinarily righteous man, the defect of whose righteousness makes him regard himself as upright, but the virtue of whose uprightness will at length disclose to his astonished view how immeasurably short of rectitude he comes. At the age of thirty, Godfrey Wardour had not yet become so displeased with himself as to turn self-roused energy upon betterment; and until then all growth must be of doubtful result. … His friends notwithstanding gave him credit for great imperturbability; but in such willfully undemonstrative men the evil burrows the more insidiously that it is masked by a constrained exterior.