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Then I came across this while reading the explanation of a Shloka in Devi Mahatmyam,
Navaneetham Hrudayam Brahmanasya Vacha: Kshuropa Nihitha Theeshna Dharam;
Vipareethamethadu Bhayam Kshatriyasya, Vak Navaneetham, Hrudayam Theeshan Dharam
A Brahmin's heart is as soft as a fresh butter, but his words? they are as sharp as the edge of a Knife. The opposite is the case of a Kshatriya. His words are soft like a butter, but his heart is as tough/sharp as a steel (knife)