The United Church of Religious Science publishes a daily affirmation on its home page:

Today's affirmation
(and click on today's link)

How to use the affirmations:

A continuous realization of the divine Presence is the pivotal element in experiencing the kind of life you desire.

When you consistently envelop yourself in a spiritual atmosphere, you align your inner being with right action.Fulfillment, joy, peace, and abundance are available to you when you consciously embrace these ideas, constructively directing your thoughts. The Daily Affirmations help you to do this.

Devote at least 15 minutes, preferably when you are alone and in a quiet place, to each day's Affirmation. Read the paragraph for content, simply being aware of the idea it expresses. Then study it more deeply, allowing your thinking to be challenged, stimulated, or enhanced. Finally, close your eyes, meditate deeply on its meaning, and let it become a part of you.