In reaching this state of equality, a person is said to have overcome the transitory conditions of birth and death. It is also said samatva allows us to see the true equality of all beings, regardless of their current state.
Krishna references samatva when he says that success and failure should be treated alike. In doing so, an individual becomes indifferent to such ups and downs, thus, is liberated from them. He also says that enlightened beings see everyone in the same way, regardless of their outward appearance, because everyone possess the same essential Self, or Atman.
The Bhagavad Gita promotes Karma yoga as a means of coming closer to samatva. Because it promotes tranquility and stability through its asanas, it can help the practitioner achieve a state of equilibrium.