A leading, non-Catholic website has compiled several lists of biblical references dealing with the conditional aspects of the promises of God, regarding eternal salvation (and various other things).
I see no conflict with authentic Catholic beliefs and/or practices in these specific links/references … which constitute a Bible study that is both practical and informative.
When God has gone to the trouble of putting important precepts in writing, it makes no sense for us “moderns” to assume that he has changed his “mind” about them, just because a number of years have passed, and we no longer find it convenient or politically correct to pay attention to the specifics of his written word!