First, I have addressed the "private interpretations" error repeatedly. 1 Peter 2:20 is NOT about privately interpreting Scripture.
Second, reasoning skills are completely distinct from understanding Scripture. Non-Christians can and do use reasoning skills, the same skills that Christians can and should use.
Third, I agree, the right understanding of spiritual things is available only to Christians by the Holy Spirit.
Fourth, the issue of "seeking signs as lying wonders" has been repeatedly addressed as well. You are off-base on this issue. Nobody here is advocating the "seeking of signs", so your repeated bleating about it is quite unnecessary.
The reasoning skills by which we can know or hear God as he gives us ears to hear are as it is wriiten .No ned to go above that which is written .Differences come by f different approaches , Some would say parables are not scripture as prophecy .While some would say they are limited to the ones that use the word parable. I would say parables are the signified language of God that he uses to hide the spiritual understanding from one and conceal it to another . The parables below uses that in respect to a kingdom of priest which typifies all believers sent from a foreign land as Ambassadors of Christ with the gospel .
He gives the honor to those like the noble Bereans (Acts17:10-12) who search the scriptures daily to see if what they hear is
The parable reads...
Proverbs 25:2 It is the glory of God to conceal a thing: but the honour of kings is to search out a matter.