Sweet instinct leaps; slow reason feebly climbs.

Trust the instinct to the end, though you can render no reason.

When blended with sexuality, the death instinct is transformed into more harmless impulses expressed in sadism or masochism.

Be a good animal, true to your animal instincts.

When I watch species other than my own, their instinct's wisdom is what most impresses and disturbs me.

Well-bred instinct meets reason halfway.

You cannot teach a crab to walk straight.

The centipede was quite happy until a toad in fun said, Tray, which leg goes after which?' That worked her mind to such a pitch, she lay distracted in a ditch considering how to run.

Follow your instincts. That's where true wisdom manifests itself.