This is material nature. In the material world you cannot be without any anxiety. That is not possible. Asad-grahāt.
Therefore Prahlāda Mahārāja, when he was asked by his father, "My dear boy, what best thing you have learned from your teachers? Will you explain to me," so Prahlāda Mahārāja immediately replied, tat sādhu manye 'sura-varya dehināṁ sadā samudvigna-dhiyām asad-grahāt: (SB 7.5.5) "Yes, I have learned the best thing is that these materialistic persons, who have accepted the asad-vastu..." Sat and asat. Sad gama asato mā: "Don't keep yourself in the asat; go to the sat." Oṁ tat sat. That is the Vedic injunction. So... Material world means asad-vastu. Asad-vastu means not good or which will not stay. Asat. Sat means which exists, and asat means not existing. So in the material world nothing will exist. It exists for some time, temporary. The Māyāvādī philosopher says that brahma satyaṁ jagan mithyā.