Psalm 136:1, “Give thanks unto the LORD; for He is good: for His mercy endures forever,” is explored as a call to gratitude. The psalm, originally a liturgical experience, teaches gratitude as a lifestyle, shaping memory and resisting forgetfulness. Modern psychology affirms gratitude’s positive impact on mental health, while the psalm’s focus on God’s hesed (steadfast love) emphasizes gratitude’s foundation in God’s unchanging character.