He needs to reason on the Scriptures so that his daughter develops conviction about what she learns.
(‏ كو ٣ :‏ ١٢‏ )‏ وَيُدْرِكُ تُومَاس أَنَّ إِقْنَاعَ ٱبْنَتِهِ قَدْ يَسْتَلْزِمُ عِدَّةَ مُنَاقَشَاتٍ عَلَى مَدَى فَتْرَةٍ مِنَ ٱلْوَقْتِ .‏