Translit: ya eva dharmaḥ so'dharmo’deśakāle pratiṣṭhitaḥ. ādānamanṛtaṃ hiṃsā dharmo hyāvasthikaḥ smṛtaḥ
Meaning: “According to differing time and place, the meaning of dharma is established. If situations become adverse then dharma becomes adharma and adharma such as lying, violence are (also) considered dharma”. --Mahabharat (Shantiparva)
This shlok is a part of Mahabharat OST. Listen to it here: https://www.youtube.com/watch?v=ICZsr3sMIZk