Even when not motivated by a selfish refusal to be burdened with the
life of someone who is suffering, euthanasia must be called a false
mercy, and indeed a disturbing "perversion" of mercy. True
"compassion" leads to sharing another's pain; it does not
kill the person whose suffering we cannot bear. Moreover, the act
of euthanasia appears all the more perverse if it is carried out by
those, like relatives, who are supposed to treat a family member with
patience and love, or by those, such as doctors, who by virtue of
their specific profession are supposed to care for the sick person
even in the most painful terminal stages. - The
Gospel of Life, #66 - John Paul II, 199