The 1974 WT book called Is This Life all there is? on page 68 quotes a book by Corliss Lamont called The Illusion of Immortality. An edition (from 1936) of that book can be read online at https://archive.org/details/in.ernet.dli.2015.222482 . I invite JWs and other Christians to have a look at that book.
Corliss was a socialist who wrote literature promoting socialism and who successfully resisted McCarthy and the C.I.A. He was also convinced of evolution, was a Humanist, and he wrote the book called Humanism As A Philosophy (later called The Philosophy of Humanism). The Second Edition of that book, bearing the copyright date of 1949, can be read at https://archive.org/details/humanismasphilos00lamo . I invite JWs and other Christians to read that book - much of what it says is very good. It makes a good case for a number of the ideas of Humanism. In his book he says that the type of Humanism he writes about has "eight central propositions". Regarding them he says the following:
First, Humanism believes in a naturalistic cosmology
or metaphysics or attitude toward the universe that
rules out all forms of the supernatural and that regards
Nature as the totality of being and as a constantly chang-
ing system of events which exists independently of any
mind or consciousness.
Second, Humanism, drawing especially upon the proven
facts of science, believes that man is an evolutionary prod-
uct of this great Nature of which he is part and that he
is an inseparable unity of body and personality having
no individual survival beyond death.
Third, Humanism believes that human thinking is as
natural as walking or breathing, that it is indivisibly
conjoined with the functioning of the brain, and that
ideas, far from existing independently in some separate
realm, arise and have reality only when a complex liv-
ing organism such as man is interacting with its environ-
ment and is intellectually active.
Fourth, Humanism believes that man has the power
and potentiality of solving his own problems successfully,
relying primarily on reason and scientific method to do
so and to enlarge continually his knowledge of the truth.
Fifth, Humanism believes, in opposition to all theories
of universal predestination, determinism or fatalism, that
human beings possess true freedom of creative action and
are, within reasonable limits, the masters of their own
destiny.
Sixth, Humanism believes in an ethics or morality
that grounds all human values in this-earthly experiences
and relationships; and that holds as its highest loyalty
the this-worldly happiness, freedom and progress — eco-
nomic, cultural and ethical — of all mankind, irrespec-
tive of nation, race or religion.
Seventh, Humanism believes in the widest possible
development of art and of the awareness of beauty, in-
cluding the appreciation of external Nature, so that the
aesthetic experience may become a pervasive reality in
the life of men.
Eighth, Humanism believes in a far-reaching social
program that stands for the establishment throughout the
world of democracy and peace on the foundations of a
flourishing and cooperative economic order, both national
and international.
These eight points embody Humanism in what I be-
lieve is its most acceptable modem form. This philosophy
can be more explicitly characterized as scientific Human-
ism, secular Humanism, naturalistic Humanism or dem-
ocratic Humanism, depending on the emphasis that one
wishes to give. Whatever it be called. Humanism is the
viewpoint that men have but one life to lead and should
make the most of it in terms of creative work and hap-
piness; that human happiness is its own justification and
requires no sanction or support from supernatural sources;
that in any case the supernatural, usually conceived of
in the form of heavenly gods or immortal heavens, does
not exist; and that human beings, using their own intel-
ligence and cooperating liberally with one another, can
build an enduring citadel of peace and beauty upon this
earth.