McCoy ruminates over Kirk’s words that he should be more like Spock.  He is talking to Spock in his thoughts:

“Jim says that I could learn more

From you and think less with my glands

How can I decrease what has always worked before?

And assist me with all that my job demands

“We are different, but we are colleagues in science

I communicate with my words and expressions

While I feel you communicate in your aloof silence

I do a damned good job, but I know my limitations

“When I see you and Jim together, what does he see?

You are his friend as well, strong and unerring

I have known Jim longer, what does he see in me?

Does he forget my qualities of faithfulness and caring?

“To be more like you, I’ve rarely thought

But after tonight in my emotional blindness

Almost losing Jim as he and Nancy fought

I was frozen, conflicted in my actions, mindless

“My heart aches from Jim’s words and the near loss of a friend

It aches for a woman I had loved, revisiting the past pain

If I were more like you, without wounds to my heart to mend

There would be no actions of mine that would be in vain

“But I’m not like you, our differences revealed

You have the safety of your Vulcan armor and logic

I have my compassion, my anger and many wounds unhealed

As I drink my whiskey, I’ll ponder what is your trick?

“Till then, will I ever be like you?