Kindness is not a single act but a lifestyle.
It is the habit of being helpful, encouraging, sympathetic, and giving. It is what you do for others that says, “I’m thinking of you.”
Even in confrontation you can be kind. You practice kindness in all you do and say, always treating others as you would want to be treated. You are even careful to not throw an “attitude” so to speak, at someone you think is functioning below your standards.
How can we behave that way knowing how God lovingly treats us though we have fallen short of His standard of holiness? How will we ever learn to love our enemies if we have trouble loving our friends and family when they fail?