My serenity is very dependent on my attitude.

When I hold an attitude of gratitude, I have serenity.

When I hold an attitude of joy, I have serenity.

When I hold an attitude of acceptance, I have serenity.

When I hold an attitude of love, I have serenity.

The list could go on and on, similar to when I draw up a gratitude list. And, simply going through the exercise is sufficient for me to feel serene. Ahhhh.