You shouldn't be judging one of God's chosen servants who has spent the last several years preaching the gospel of God to end the millennium reign of Christ.
Besides, you need to check out that verse again. The scriptures were never used by us servants to preach the gospel of God but the prophecies are used by God to prove to us servants that our testimonies are true and accurate. Once our testimonies are proven to us to be true, then we're given great boldness to preach each word our Father in heaven forms in our mind just like our Father gave Jesus to preach.
John 14
23: Jesus answered him, "If a man loves me, he will keep my word, and my Father will love him, and we will come to him and make our home with him.
24: He who does not love me does not keep my words; and the word which you hear is not mine but the Father's who sent me.
25: "These things I have spoken to you, while I am still with you.
26: But the Counselor, the Holy Spirit, whom the Father will send in my name, he will teach you all things, and bring to your remembrance all that I have said to you.
I am empowered by the Holy Spirit of God ( our Father in heaven )to preach his words from the knowledge called Christ that I have testified to in written and spoken form. Only those of us who have obtained the mind of Christ will understand all the deeper hidden things that no man has ever seen.
I know our Father has guided you to some scriptures that are true to our testimonies in Christ but the Devil can totally confuse chosen believers because they do not have all the knowledge of Christ to resist that deceiving power in their minds.
This means you may have 30 to 60 fold of the word of God but not 100%. Only a few chosen men have ever received 100% of the knowledge of Christ.