Thats what catholics teach.
The truth about the devide from the Catholic church, when the reformation begun, was all about How we can know we have grace, by understanding the corrupt nature of human will, we could fully understand his grace, and know that we can have full assurance where saved by his grace, by understanding our will and God's will for us,
Your church was against this idea, and one of reasons for that what they believed only there great saints could have full assurance of having 100 percent assurance.
Well understanding faith is known aware through inner conscience is key importance to using apologetics to teach assurance you can have full assurance your walking with God. By reaching the truth about the condition of human will.
That's what Augustine Martyn Luther John Calvin was all about and all other good teachers of the reformed faith, to help believe they don't have to suffer not knowing they can have full assurance