Say it On The Mat

generosity - doyouyoga.com

I've never been a trend follower.
But, yoga is not a trend.  It is a movement.  It is a healthy tsunami that is crossing oceans, land masses, and cultures.
Purists, and early adapters may struggle with chagrin, which is very anti-yogic, when they read about Wine Yoga, and Goat Yoga, but the more Zen the practitioner, the better the understanding that it doesn't matter.
Yoga for fitness simply works.  Simply, for anyone.  Yes, any age, any gender, any fitness status.

gratitude
forgiveness
joy
yogajournal.com 

For some, it is hard to break the barrier into yoga, principally because, indeed, it is more than just exercise for fitness.  Truthfully, while it is most visible, physical well being is a fringe (well, okay, pretty important) benefit that is often the nugget of attraction to stepping onto the mat.  But it is not the only one.  Some come to reduce anxiety and find calm.  Some come for socialization.  I came for the breathing.  The physical well being is only part of the package.
I am not a yoga teacher.  Perhaps one day, I will lead a yoga practice and if I do, to prepare myself, and set my nerves away from kilter, I shall tap into some easy feelings, positive feelings, that will guide me to guide others.  These feelings are ordinary ones.  Nothing special, but ones I have sensed more frequently and regularly through practicing yoga.  They are every-day, passing feelings that anyone can garner, anytime, but funnily enough, they are abundantly present on the yoga mat.

humility - yogadigest.com

To prepare myself for the day when I might one day lead a yoga practice, I have endeavored to look a bit deeper into ten feelings, or traits, or actions, to see what others have said about them, in relation to yoga practice:

...humility

 The poses that are best for you are those you can practice comfortably, without pain and without strain.  A humble attitude can keep you safe. (yogadigest.com)

...generosity

"I have learned to give without expectation."  "In generosity and helping others: be like the river." (Rumi) 

...gratitude .... forgiveness .... joy

 "Gratitude can soften a heart that has become too guarded and it builds the capacity for forgiveness" 

Peace - gaiam.com

Having access to joy and wonderment of life is the antidote to feelings of scarcity and loss (Philip Moffitt).

...peace 

"Whichever one is most comfortable, that’s the best position for you to find peace of mind." Just sitting still and breathing will help calm your mind (GAIAM)
Wisdom, permission, and honour are three other notions that I sought to connect to Yoga, but these are not as straight forward, not as obvious.  Perhaps, wisdom, like magical power, is a trait we cannot strive toward.  It is merely granted.  Honour, is within the translation of the salutation, Namaste, and is integral to yoga practice.  But, permission - this one, is tied to ability to change, and ability to be yourself.  It is freedom really.

Freedom - StuffILearnedAtYoga.com

...freedom

"Yoga is described as the path of liberation... from suffering" "In retrospect I realized one of the very first fundamental kinds of freedom is the ability to understand yourself, and your situation." (StuffILearnedAtYoga)
This is simply my little list.  A top-of-mind list.  Any yoga leader can use such nuggets to begin or end a class, or to tie class elements together.  To add coherence.  To learn, and make sense of our practice.
Yoga is not a religious activity.  It is a human activity.  It connects us to our humanity on a great many levels.
If anyone wants to find an abundance of quotations for yoga, simply go to wikiquote.org/wiki/yoga