take for granted

verb2

1. •
   To assume something to be true without verification or proof.

   • Most people take the imprint "Not Transferable" for granted when buying railway tickets, and are sufficiently law-abiding not to think of transferring a return half to a relation or friend. — 1959
2. •
   To give little attention to or to underestimate the value of; to fail to appreciate, especially something one has grown heavily accustomed to; not to value or care for appropriately, out of the assumption that the person or thing not valued cannot be lost.

   • He had fiercely championed loveless ladies entering frustrated middle age, the married woman whose husband took her for granted and seldom into his arms. — 1946