高手，您說的對，不僅細看，還挑出錯了:))

steal away 有兩解:

1. 偷走(某物)
Mary stole away your heart.
瑪麗偷走了你的心。

2. 偷偷離去
He stole away without anyone seeing him.
他偷偷地走了, 誰也沒有看到他。
"Steal away from bad company" here means to leave bad guys swiftly and silently like a thief might.
One should surround himself with good people.

So your understanding is right. Thanks :)