What I know for sure is that what you give comes back to you.

我非常确信一点，就是你付出过什么，你就会有什么回报。

youdao

But what I know for sure is that when I stop playing I want a complete break.

但现在能确定的是当我退役时，我想得到一次完完全全的休息。

youdao

This is what I know for sure: in order to be truly happy, you must live along with and you have to stand for something larger than yourself.

我可以非常肯定的是为了追求真正的快乐，你必须为了一些更有意义的事而生活。

youdao

What I know for sure is that Social Security is the backbone of our country.

FORBES: Will Social Security be there for You?

But here is what I know for sure.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event -- Reno, NV

But here is the thing I am so proud of -- when I travel across the country -- and I've come in and out of all kinds of communities -- this is what I know for sure.

WHITEHOUSE: The White House