St. Augustine's case is a classic example of discordant personality. You all remember his half-pagan, half-Christian bringing up at Carthage, his emigration to Rome and Milan, his adoption of Manicheism and subsequent skepticism, and his restless search for truth and purity of life; and finally how, distracted by the struggle between the two souls in his breast, and ashamed of his own weakness of will when so many others whom he knew and knew of had thrown off the shackles of sensuality and dedicated themselves to chastity and the higher life, he heard a voice in the garden say, "Sume, lege" (take and read), and opening the Bible at random, saw the text, "not in chambering and wantonness," etc., which seemed directly sent to his address, and laid the inner storm to rest forever. Augustine's psychological genius has given an account of the trouble of having a divided self which has never been surpassed.
The new will which I began to have was not yet strong enough to overcome that other will, strengthened by long indulgence. So these two wills, one old, one new, one carnal, the other spiritual, contended with each other and disturbed my soul. I understood by my own experience what I had read, "Flesh lusteth against spirit, and spirit against flesh." It was myself indeed in both the wills, yet more myself in that which I approved in myself than in that which I disapproved in myself. Yet it was through myself that habit had obtained so fierce a mastery over me, because I had willingly come whither I willed not. Still bound to earth, I refused, O God, to fight on thy side, as much afraid to be freed from all bonds as I ought to have feared being trammeled by them.
Thus the thoughts by which I meditated upon thee were like the efforts of one who would awake, but being overpowered with sleepiness is soon asleep again. Often does a man when heavy sleepiness is on his limbs defer to shake it off, and though not approving it, encourage it; even so I was sure it was better to surrender to thy love than to yield to my own lusts, yet, though the former course convinced me, the latter pleased and held me bound. There was naught in me to answer thy call, "Awake, thou sleeper," but only drawling, drowsy words, "Presently; yes, presently; wait a little while." But the "presently" had no "present," and the "little while" grew long. For I was afraid thou wouldst hear me too soon, and heal me at once of my disease of lust, which I wished to satiate rather than to see extinguished. With what lashes of words did I not scourge my own soul. Yet it shrank back; it refused, though it had no excuse to offer. I said within myself: "Come, let it be done now," and as I said it, I was on the point of the resolve. I all but did it, yet I did not do it. And I made another effort, and almost succeeded, yet I did not reach it, and did not grasp it, hesitating to die to death, and live to life; and the evil to which I was so wonted held me more than the better life I had not tried.