My rendition: Where to put one's heart?
The respectable elder Subhuti in the assembly rose from his seat, bared his right shoulder, knelt on his right knee with his palms joined, and respectfully addressed the Buddha: “World Honored One, Tathagata compassionately cares about and compassionately advise all Bodhisattvas. When good men and good women vow to attain the highest level of enlightenment, where should they put their restless heart?”
Buddha replied, "Good question. As you said "Tathagata compassionately cares about and compassionately advise all Bodhisattvas". Now listen carefully, when good men and women vow to attain the highest level of enlightenment, this is where they should put their restless heart."
Subhuti said: “Yes, World Honored One. We are listening with great anticipation.”
Paul's comment: The Diamond Sutra contains many riddles, and this chapter contains one important riddle. The solution of which leads to a better understanding of the Sutra.
I have to say most readers of the Sutra will likely miss the point here. In the last statement, Subhuti said: we are listening with great anticipation. An alert reader will wonder, in the previous reply, the Buddha clearly started with "a good question" and finished with "this is where they should put their restless heart". Apparently the Buddha thought he had given an answer to Subhuti's question, and Subhuti simply didn't understand it or he tried to seek further elaboration.
My interpretation is that he was seeking further elaboration (prominent scholar Nan Huaijin [南懷瑾] believed the case to be the latter, whereas most interpreters failed to grasp this point). Then what exactly was the Buddha's advice. Well, the Buddha said it clearly: learn from my example: "Tathagata compassionately cares about and compassionately advise all Bodhisattvas". Still don't get it? No matter, as Nan said, even Subhuti didn't get it!