You have to learn to trust/follow your 'instincts'. [=to trust your feelings about what is right or true even when you cannot be sure that it is right or true]
Her 'instincts' told her that something was wrong. [=she believed that something was wrong even though there was no obvious reason to believe it]
Her 'killer instincts' have helped her become one of the top tennis players in the world.
(..) to the defeat of his brother. But that was not for the sake of Paris. It was a quarrel between them. And now Rollo has the upper hand, I fear he may revert to his instincts. Rollo's conversion to Christianity is a joke. For there is nothing else in the mind of the pagan Rollo but the destruction of (..)2016 TvShow: Vikings Title: Portage Season: 4 Episode 8