In other words, Saint Taiqing tossed the system set up by the Heavenly Dao to a tower.
He couldn't be bothered to use it himself.
It had no effect on his own strength.
"But you and Saint Jie Yin from the Western Religion are different. You both lack the necessary strength, so you made grand vows and advanced borrowed the strength of a saint from the Heavenly Dao. This in turn put you in a loan relationship with the Heavenly Dao where you must pay regular installments, with lots of interest to boot."
"Suppose you and Jie Yin don't pay your Heavenly Dao debts on time, both of you will be blacklisted by the Heavenly Dao."
"At that point, let alone being a saint, you both might even be worse than quasi-saints. In fact, if you didn't take on these loans, you and Jie Yin wouldn't be too different from other quasi-saints, maybe even weaker than many quasi-saints."
In his previous life, Ji Changsheng had mortgaged a house, so he's intimately familiar with the procedure.