thought occurs to you
thought strikes you
thought comes to you

The thought of making love with her came to him.

If one thought had come, then others should be available.

He looked as though another thought had just come to him.

Another thought came to him as he looked down at her.

Thought I'd come and see if you needed a friend.

It seemed the right thing to do, but he had no idea where the thought came from.

He continued to hold onto her hand as a thought came to him.

A thought came to him, one that made his blood run cold.

Then another thought came into her mind: I'm going to be late.

The thought came to him: he had to have a woman.