The time will come when men such as I will
look upon the murder of
animals as they now look on the murder of men.
Leonardo Da Vinci
True human goodness, in all its purity and freedom, can
come to the fore only when its recipient has no power. Mankind's
true moral test, its fundamental test (which lies deeply buried
from view), consists of its attitude towards those who are as
its mercy: animals. And in this respect mankind has suffered a
fundamental debacle, a debacle so fundamental that all others
stem from it. 
Milan Kundera
Non-violence leads to the highest ethics,
which is the goal of all evolution. Until we stop harming all
other living beings, we are still savages.
Thomas Edison
The greatness of a nation and its moral progress
can be judged by the way its animals are treated.
Gandhi
It is man's sympathy with all creatures that
first makes him truly a man.
Albert Schweitzer
To a man whose mind is free there is something
even more intolerable in the sufferings of animals than in the
sufferings of man. For with the latter it is at least admitted
that suffering is evil and that the man who causes it is a criminal.
But thousands of animals are uselessly butchered every day without
a shadow of remorse. If any man were to refer to it, he would
be thought ridiculous. And that is the unpardonable crime.
Romain Rolland
Shame on such a morality that fails to recognise
the eternal essence that exists in every living thing, and shines
forth with inscrutable significance from all eyes that see the
sun!
Schopenhauer
Our task must be to free ourselves...by widening
our circle of compassion to embrace all living creatures and the
whole of nature and its beauty.
Einstein
What is it that should trace the insuperable
line? ...The question is not, Can they reason? nor, Can they talk?
but, Can they suffer?
Jeremy Bentham
