I often read poetry by John O'Donohue in class, and I love particularly the beginning of this blessing:
"May you awaken to the mystery of being here
and enter the quiet immensity of your own presence"
It seems to me that that's exactly what yoga is about, so I memorized those words and repeat them to myself (and to the students) from time to time.
Here is the full poem/blessing:
May you awaken to the mystery of being here
and enter the quiet immensity of your own presence.
May you have joy and peace in the temple of your senses.
May you receive great encouragement when new frontiers beckon.
May you respond to the call of your gift and find the courage to follow its path.
May the flame of anger free you from falsity.
May warmth of heart keep your presence aflame and may anxiety never linger about you.
May your outer dignity mirror an inner dignity of soul.
May you take time to celebrate the quiet miracles that seek no attention.
May you be consoled in the secret symmetry of your soul.
May you experience each day as a sacred gift woven
around the heart of wonder.