You should always give 100%. If you do that then no-one can ask any more of you. Someone once said to me when I was a kid: 'If you're asked to do ten sprints, by all means do 11 but never do nine because you're only cheating yourself'.
The usual sniggering examples of animal behaviour were brought in to explain cheating. Funny how the behaviour of shrews and gibbons is never used to explain table manners or road safety or gardening, only sex. Anyway, it was bad Darwinism. Taking the example of a monkey and applying it to yourself misses the point that animal behaviour is made for the benefit of the species, not as an excuse for the individual. Being incapable of sustaining a stable pair and supporting children is really not in the interests of our species. Neither is it really in the best interests of the philanderer.
Occident: The part of the world lying west (or east) of the Orient. It is largely inhabited by Christians, a powerful subtribe of the Hypocrites, whose principal industries are murder and cheating, which they are pleased to call war and commerce. These, also, are the principal industries of the Orient.
Life is essentially a cheat and its conditions are those of defeat; the redeeming things are not happiness and pleasure but the deeper satisfactions that come out of struggle.