Children need to learn to be gritty if they are not born with it. Overly generalizing here. All things in life is either instantly gratifying but in long term

Children need to learn to be gritty if they are not born with it. Overly generalizing here. All things in life is either instantly gratifying but in long term harmful or initially grinding but in long term joyful. How are children supposed to know something will be fun 10 years, 20 years down the road? They either pick up from parent/peers/school or us parent imposed our version of "later it will be cool" on them.