 <translate> Consider the question. The concept of original sin was first alluded to in the 2nd century by Irenaeus, Bishop of Lyon in his controversy with certain dualist Gnostics. Other church fathers such as Augustine also developed the doctrine, seeing it as based on the New Testament teaching of Paul the Apostle (Romans 5: 12 -- 21 and 1 Corinthians 15: 22) and the Old Testament verse of Psalms 51: 5. Tertullian, Cyprian, Ambrose and Ambrosiaster considered that humanity shares in Adam's sin, transmitted by human generation. Augustine's formulation of original sin was popular among Protestant reformers, such as Martin Luther and John Calvin, who equated original sin with concupiscence (or "hurtful desire"), affirming that it persisted even after baptism and completely destroyed freedom. The Jansenist movement, which the Catholic Church declared to be heretical, also maintained that original sin destroyed freedom of will.

Answer this question based on the passage: when did the doctrine of original sin begin?
 What is the step-by-step reasoning process to arrive at the answer: the 2nd century? <yor> Gbé ìbéèrè yìí yẹ̀ wò. Irenaeus, Bíṣọ́ọ̀bù Lyon, ló kọ́kọ́ mẹ́nu kan èròǹgbà ẹ̀ṣẹ̀ àjogúnbá ní ọ̀rúndún kejì nínú awuyewuye tó ní pẹ̀lú àwọn Gnostic kan tí wọ́n gbà pé ẹ̀ṣẹ̀ méjì wà. Àwọn bàbá ìjọ mìíràn bíi Augustine tún gbé ẹ̀kọ́ náà kalẹ̀, tí wọ́n rí i pé ó dá lórí ẹ̀kọ́ Májẹ̀mú Tuntun ti Àpọ́sítélì Pọ́ọ̀lù (Róòmù 5: 12 - 21 àti 1 Kọ́ríńtì 15: 22) àti ẹsẹ Májẹ̀mú Láéláé ti Sáàmù 51: 5. Tertullian, Cyprian, Ambrose, àti Ambrosiaster gbà pé ẹ̀dá ènìyàn nípìn-ín nínú ẹ̀ṣẹ̀ Ádámù, èyí tí àtọmọdọ́mọ ènìyàn ti jogún. Ọ̀rọ̀ tí Augustine sọ nípa ẹ̀ṣẹ̀ àjogúnbá gbajúmọ̀ láàárín àwọn alátùn-únṣe ẹ̀sìn Pùròtẹ́sítáǹtì, irú bíi Martin Luther àti John Calvin, tí wọ́n fi ẹ̀ṣẹ̀ àjogúnbá wé ìfẹ́kúfẹ̀ẹ́ (tàbí "ìfẹ́kúfẹ̀ẹ́ tó ń pani lára"), tí wọ́n sì sọ pé ẹ̀ṣẹ̀ náà ṣì ń bá a nìṣó kódà lẹ́yìn ìrìbọmi, ó sì ti ba òmìnira èèyàn jẹ́ pátápátá. Ẹgbẹ́ Jansenist, tí Ṣọ́ọ̀ṣì Kátólíìkì sọ pé ó jẹ́ agbawèrèmẹ́sìn, tún sọ pé ẹ̀ṣẹ̀ àjogúnbá ti ba òmìnira láti yan ohun tó wù wá jẹ́.  Wá ìdáhùn sí ìbéèrè yìí látinú ẹsẹ Bíbélì yìí: Ìgbà wo ni ẹ̀kọ́ èké nípa ẹ̀ṣẹ̀ àjogúnbá bẹ̀rẹ̀? Báwo la ṣe máa gbé ìbéèrè yìí yẹ̀ wò ní ṣísẹ̀-n-tẹ̀lé ká tó lè rí ìdáhùn sí ìbéèrè náà: ọ̀rúndún kejì? 