Itachi and madara talks about their sharingan

Uchiha Madara

The Sharingan reaches its true potential through battle and conquest.

Uchiha Madara

Something a pacifist like you could never understand, Itachi.

Uchiha Itachi

True mastery comes from understanding its limits...

Uchiha Itachi

And knowing when not to use it at all.

Uchiha Madara

Your restraint is nothing but weakness. Look where it got our clan!

Uchiha Itachi

And your power led to endless war.

Uchiha Itachi

Perhaps the true measure of a Sharingan user is not in how many techniques they master...

Uchiha Madara

Then enlighten me, what is it?

Uchiha Itachi

In how many lives they choose to spare.

Uchiha Itachi

Would you like more tea, Madara-san?