Defining nursing with a single word...

I am doing an artistic project for nursing, and I am doing a wood carving....in big letters I have "Nursing is..." and the plan is to use single words, or maybe sets of 3-4 words to describe nursing in small text underneath as a list.

What words would you use to complete the sentence "Nursing is...", in either 1 word or under 4 words.

Thanks for the help all, it is greatly appreciated =]
Sacrifice

Fulfilling

Compassion

Okay, so the list I came up with has all of the following:SacrificeHonestyIntegrityCompassionProfessionalismHopeCommitmentEmpathyUnderstandingThoughtfulnessA True Calling

Servant

CaringImplies both the active physical care we give as well as the attitude.

Learning, caring, knowing, doing

hard.

Stressful

Frustrating.

Rewarding

Intriguing