Here are some great quotes I've come across:

I like a teacher who gives you something to take home to think about besides
homework.  ~Lily Tomlin as "Edith Ann"

If at first you don't succeed, do it like your mother told you. ~Author Unknown

Life has taught us that love does not consist in gazing at each other but in looking
outward together in the same direction.  ~Antoine de Saint-Exupéry, Wind, Sand and Stars

Love is being stupid together.  ~Paul Valery

Teaching is the profession that teaches all the other professions.  ~Author Unknown

We are all a little weird and life's a little weird, and when we find someone whose
weirdness is compatible with ours, we join up with them and fall in mutual
weirdness and call it love.  ~Author Unknown

The only guy I have to get better than is who I am right now.  ~M*A*S*H, Colonel Potter

If you can't feed a hundred people, then feed just one.  ~Mother Teresa

I hope that my achievements in life shall be these - that I will have fought for what
was right and fair, that I will have risked for that which mattered, and that I
will have given help to those who were in need that I will have left the earth
a better place for what I've done and who I've been.  ~C. Hoppe

Service to others is the rent you pay for your room here on earth.  ~Mohammed Ali