Lindsay in an article titled, "Entropy consumption and values in physical science," (Am. Sci. 1959, 47, 678-696) proposed a Thermodynamic Imperative similar to Kant's Ethical Categorical Imperative. In this paper, after describing the concept of ethical imperative as elaborated by Kant, we provide a brief discussion of the role of science and its relationship to the classical thermodynamics and the physical implications of the first and the second laws of thermodynamics. We finally attempt to extend and supplement Lindsay's Thermodynamic Imperative (TI), by another Imperative suggesting simplicity, conservation, and harmony.