Carvaka Muni says that you take loan from your friends if you have no money and eat as much as possible ghee. Ṛṇaṁ kṛtvā ghṛtaṁ pibet yāvaj jīvet sukhaṁ jīvet. And so long you live, you live by gratifying your senses. Here sukham means sense gratification.
But according to Vedic civilization, sukham ātyantikaṁ yat tad atīndriyam grāhyam (BG 6.21). What is the actual happiness? That is beyond your senses. Not sense gratification. But because we are materially absorbed, we think indriyāṇi parāṇy āhur (BG 3.42). Indriya. the senses, always all. To satisfy the senses that is sukh. That is happiness. And those who are a little disgusted with sense gratification, indriyāṇi parāṇy āhur indriyebhyaḥ paraṁ manaḥ (BG 3.42). They are mental speculators. They write poetries and utopian theories, "This philosophy, that philosophy." In this way they satisfy the mind. But that is also not happiness. Mental happiness. Mano-rathena asato dhāvato bahiḥ. If you become satisfied by mental happiness, then you'll have to come down again. Asato. Asato mā sad-gamaḥ. Real life is: "Don't stay in this temporary world but go to the real world, paras tasmāt tu bhāvo 'nyo 'vyakto 'vyaktāt sanātanaḥ (BG 8.20). You'll find all these things in Bhagavad-gītā. So either on the bodily plane or on the mental plane you cannot be happy. That is not possible. But if you want to be happy then you have to come to the spiritual platform and engage in spiritual activities, sukham ātyantikaṁ yat tad atīndriyam grāhyam (BG 6.21). Atīndriya means above the material platform of sensual and mental activities.