The Quranic principle of 'remembering Him standing, sitting, and lying down' refers to the profound Islamic concept of maintaining a continuous and all-encompassing state of dhikr (remembrance of Allah). This practice transcends formal acts of worship and integrates God-consciousness into every moment of a believer's life, regardless of their physical posture or activity. Classical scholars like Ibn Kathir explain that this signifies a perpetual state of mindfulness, where the heart and tongue are engaged in the remembrance of God in all conditions. The verses mentioning this practice, such as 3:191 and 4:103, highlight it as a characteristic of the wise and a means of attaining spiritual tranquility and a deep, abiding connection with the Creator.