Man has been called a rational being, but rationality is a matter of choice -...

Man has been called a rational being, but rationality is a matter of choice - and the alternative his nature offers him is: rational being or suicidal animal. Man has to be man - by choice; he has to hold his life as a value - by choice; he has to learn to sustain it - by choice; he has to discover the values it requires and practice his virtues - by choice.
A code of values accepted by choice is a code of morality.