He said there is something wrong with a woman not desiring biological children.
Also, is there any opposition between being a scientist and being a spiritual mother? There have been many nun scientists and mathematicians throughout Church history.
There are certainly Catholic women who go on to become scientists and mathematicians and spiritual motherhood for them would be desirable. What happens with most women who go down the career path is that they struggle with the notion of contraception or limiting children for the sake of their career. Or worse, sending their children off to a babysitter in order to maintain their career. If a woman is dedicated to remaining single or taking vows, she could certainly attempt a career and do well, even spiritually, given her decision is a prayerful one. A Catholic woman should understand what she's getting herself into before she takes any path. And sadly, many haven't a clue because their parents dropped the ball when it came to educating them. It seems to me that a Catholic school for young women would be the ideal. Schooling girls like boys leads to a lot of dead ends for the girl who finds herself a fish out of water no matter what she chooses to do. Teaching Catholic girls how to raise children, run a home, develop a talent, balance a budget, change a toilet, farm animals and food, be a good wife and mother...was a dream of mine, but with the size family I have, my dream probably won't be realized for others, just for my own girls.