This is different. We don't personally know these people.

不同的嘛，我们私下根本就不认识他们。

Do you personally know anyone who has dealt with this person before?

你知道有谁以前是和这个人打过交道的？

Never before have I had this desire to idolize anybody, much less someone I don't really personally know.

我从未有过这般冲动去崇拜任何一个人，特别是一个我不曾亲身认识的人。

The bearer of this letter is Mr. Li whom I personally know to be a most deserving person for your position.

这内介绍的这封信的持有者李先生，我个人认为是这个植寤的最佳人选。