- Being the source of goodness, God, even after our failures, calls us anew, not effacing entirely from our mind the knowledge of good, even if we have turned away from virtue through sin. This is what God, at present, also does for Adam in calling him although he has hidden himself, saying to him: 'Adam, where art thou?' Adam, in fact, had been placed there by God for the purpose of working and guarding Paradise; he had received this place from Him to be his own. Having distanced himself from there by disobedience, it is proper that he should hear from God: 'Where art thou?' - From Didymus the Blind 
Didymus the Blind (c. 313 – 398) was an Eastern Church theologian of Alexandria whose famous Catechetical School, he led for about half a century. He became blind at a very young age, and therefore ignorant of the rudiments of learning. Yet, he displayed such a miracle of intelligence as to learn perfectlydialectics and even geometry, sciences which especially require sight.
Didymus wrote many admirable works: Commentaries on all the Psalms, the Gospel of Matthew, the Gospel of John as Against the Arians, and On the Holy Spirit, which Jerome translated into Latin. He also wrote on Isaiah, Hosea, Zechariah, Job, and many other topics. (See Jerome and Early Church Fathers, Chapter 109)
Didymus’ biblical commentaries (supposedly on nearly all the books of the Bible) survive in fragments only, and those on the Catholic Letters are of dubious authenticity. He is probably the author of a treatise on the Holy Spirit that is extant in Latin translation.
Although he became blind at the age of four, before he had learned to read, he succeeded in mastering the whole gamut of the sciences then known. He was a loyal student of Origen, though stoutly opposed to Arian and Macedonian teaching. Such of his writings as survive show a remarkable knowledge of scripture, and have distinct value as theological literature. Among them are the De Trinitate (On the Trinity), De Spiritu Sancto (On the Holy Spirit) (Jerome's Latin translation), Adversus Manichaeos (Against the Manichaeans), and notes and expositions of various books, especially the Psalms and the Catholic Epistles.
Catechetical School of Alexandria
Upon entering the service of the Church he was placed at the head of the Catechetical School of Alexandria, where he lived and worked. According to Palladius, the 5th-century bishop and historian, Didymus remained a layman all his life and became one of the most learned ascetics of his time. He counted among his pupils Jerome and Rufinus
Like Origen, Didymus taught universal salvation, writing that "in the liberation of all no one remains a captive," and believing that divine punishment is remedial in nature. Jerome, who often spoke of Didymus not as the blind but as "the Seer," wrote that Didymus "surpassed all of his day in knowledge of the Scriptures" and Socrates of Constantinople later called him "the great bulwark of the true faith". Didymus was viewed as an orthodox Christian teacher and was greatly respected and admired up until at least 553.
Second Council of Constantinople
In 553 the Second Council of Constantinople condemned his works but not his person. In the Third Council of Constantinople in 680, Didymus was again linked with and condemned with Origen. However, the doctrine of Origen and Didymus that was found to be the most "heretical" was not universalism, nor was it the reliance on the non canonical Gospel according to the Hebrews, nor even his belief that Matthew and Levi were two different people, but rather the belief in the "Abominable doctrine of the transmigration of souls".
As a result of his condemnation many of his works were not copied during the Middle Ages and were subsequently lost. However, a group of 6th or 7th century papyrus codices discovered in 1941 near Toura, Egypt (south of Cairo) include his commentaries on Job, Zechariah, Genesis, and (of uncertain authenticity) on Ecclesiastes and Psalms 20-46.
Despite his blindness, Didymus excelled in scholarship because of his incredible memory. He found ways to help blind people to read, and experimented with carved wooden letters, a precursor to Braille systems used by the blind today.
Didymus the Blind is portrayed in Flow Down Like Silver, Hypatia of Alexandria by Ki Longfellow, a novel published in 2009.
- Richard A. Layton, Didymus the Blind and his circle in late-antique Alexandria University of Illinois Press, 2004. ISBN 0252028813
- Philip Schaff (ed.), Nicene and Post-Nicene Fathers of the Christian Church , Volume 3, Second Series, T. & T. Clark, 1991 P. 381.
- "Didymus the Blind". Catholic Encyclopedia. http://www.newadvent.org/cathen/04784a.htm. Retrieved 2007-02-17.
- Mercy Aiken. "Didymus the Blind". Accessed Nov. 30, 2007.
- "Didymus the Blind". Oxford Dictionary of the Christian Church. edition 2, page 402.
- "Prologue of Ohrid by St. Nikolai of Zica". http://www.westsrbdio.org/prolog/my.html?month=October&day=18. Retrieved 2007-09-07.
- "Coptic Orthodox Church Centre, UK". http://www.copticcentre.com/three.html. Retrieved 2007-09-07.
- This article incorporates text from the Encyclopædia Britannica, Eleventh Edition, a publication now in the public domain.
- Didymus the Blind at OrthodoxWiki
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