She wanted to be alone, to think her own thoughts.

I just want to have time to think my own thoughts.

At last, you are free to think your own thoughts.

He knew she was probably thinking thoughts much like his.

I could almost see her mind working and she wasn't thinking nice thoughts.

Months would go by when she did not think such thoughts.

He had certainly never thought thoughts like these before in his life.

But they all stopped for a moment, to look, and to think their private thoughts.

But this was no time to be thinking such thoughts.

He has been told to not think sexual thoughts, with no success.