知道
A man knows when he is growing old because he begins to look like his father.
If you aren't in over your head, how do you know how tall you are?
We shall not cease from exploration, and the end of all our exploring will be to arrive where we started and know the place for the first time.
I know of only one duty, and that is to love.
All you have to do is write one true sentence. Write the truest sentence that you know.
The best way to find out if you can trust somebody is to trust them.