What is the answer to the one who says, "The knowledge of 'aqidah hardens the heart?"

The questioner:
He says: Honorable Shaykh, may Allah grant you success, we have heard it said that a student of knowledge, when he turns to learning the knowledge of 'aqidah, should read with it some of the softeners; because the knowledge of 'aqidah

The Shaykh:
should be read. He should read with it some of the softeners, because the knowledge of 'aqidah [refers to] the softeners, meaning the admonitions.

The questioner:
that the knowledge of 'aqidah hardens the heart, is this statement correct?

The Shaykh:
This is false speech; this is Sufi speech. The speech of the Sufis does not purify the creed and teach the pure creed, but rather mixes something else with it. They claim that tawhid (the oneness of Allah) targets the heart but does not soften the heart. , So tawhid softens the heart, whereas the one who says that it targets the heart does not understand tawhid and does not know it. The Sufis have written books and myths, and they think that these are what affect the heart, and that tawhid targets the heart. Yes.