A final comment on his character is that he was so careful as a reviewer of mathematics papers, spending so much time checking every formula with the utmost care, that he had to give up the work since it was too time consuming.
Ng isang pangwakas na puna sa kanyang pagkatao ay na siya ay kaya maingat na bilang isang reviewer ng matematika papeles, paggastos kaya marami oras-check ang bawat formula sa sukdulan ng pag-aalaga, na siya had to give up ang trabaho dahil ito ay masyadong oras ubos.