"I know, Spock, but it's been a while since we tried this trick."

Those who didn't know Spock well wouldn't have even noticed.

Only someone who knew Spock well could see the subtle look of alarm that came to his face.

She had never had the chance to know Spock well.

"You know, Spock, there's something odd going on around here."

He felt a strong and beloved touch, and knew Spock.

Kirk had known Spock for many years, but had never seen him like this.

Someone who knows Spock like the back of his hand.

"I must know whether she lives or dies, Spock," the captain said.

Kirk knew Spock well enough to understand what he wasn't saying.