Let me clarify, salvation is achieved by grace. Our good works are required but they do not merit us salvation, that is by grace. And even our good works are inspired by the grace of God and done with the help of the grace of God. Now that cooperation is said to merit us a greater reward, but still all is only done by God's grace. I hope that helps. Both Augustine and Aquinas have written well on this.
Yes, we've heard Roman Catholics trying to work around the errors of their own catechism. Either good works are the result of our salvation or good works result in our salvation.
Rome, sadly, teaches the latter which is a lie. From the RCC catechism...
2027 - No one can merit the initial grace which is at the origin of conversion. Moved by the Holy Spirit, we can merit for ourselves and for others all the graces needed to attain eternal life, as well as necessary temporal goods. 2010 - Since the initiative belongs to God in the order of grace, no one can merit the initial grace of forgiveness and justification, at the beginning of conversion. Moved by the Holy Spirit and by charity, we can then merit for ourselves and for others the graces needed for our sanctification, for the increase of grace and charity, and for the attainment of eternal life. Even temporal goods like health and friendship can be merited in accordance with God's wisdom. These graces and goods are the object of Christian prayer. Prayer attends to the grace we need for meritorious actions.
Your own catechism says a man's good works "merit for ourselves and for others all the graces need to attain eternal life."
"As well as temporary goods."
You mean like cash and strawberries?
Nothing proves the point of Rome's anti-Scriptural heresies as clearly as its own catechism.