Some quotes from Zen Master Rinzai Gigen.
Note: The translations for the word "heart" could be replaced with "mind".
ADDED:
"Followers of the Way, when I say that there is no Dharma outside, the students do not understand and deduce it is necessary to search within themselves. Then they sit, leaning against a wall, tongue pressed to the upper palate, and remain so motionless. That is what they take for the patriarchal gate of the Buddha-Dharma. What a great error! If you take the state of immovable purity for THIS, you acknowledge ignorance as your master.

An old master said: "To get lost in the depth of the dark cave, is surely a cause for fear and trembling."
But if you take the moving as THIS, all the grasses and trees can move and so should possess the Way. Therefore, what moves belongs to the element of air (wind); what does not move belongs to the element of earth; and what both moves and does not move
has no being in itself. If you think to grasp the moving, it will
hold itself motionless. And if you try to grasp the motionless, it will take to moving, "as a fish in a pool rises when waves are stirred.""
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