Dale’s Law, more precisely “Dale’s principle”, emerged in the early 20th century from neurochemical work led by British physiologist Sir Henry Hallett Dale, who, building on his studies of acetylcholine (c. 1914–1935), proposed that an individual neuron has a characteristic chemical mode of signalling. This idea was experimentally strengthened by Otto Loewi’s 1921 demonstration of chemical neurotransmission (“Vagusstoff,” later identified as acetylcholine) and later formalised and popularised by Sir John Eccles in the mid-20th century (notably 1954), who phrased it as the rule that a neuron releases the same transmitter at all its synapses. This insight was later refined (not disproven) as neuroscience recognised cotransmission and neuromodulators while retaining the core idea of neuronal chemical identity. Taken together, this work anchored modern neurochemistry by linking structure to function and enabling rational treatments for neurological and psychiatric disease (Dale, 1935; Loewi, 1921; Eccles, 1954). From a Christian perspective, Dale’s Law can be seen as consonant with a theology of ordered creation: the brain’s reliable chemical signalling reflects a world made with intelligible patterns (Psalm 19:1), humans as “fearfully and wonderfully made” (Psalm 139:14), and diverse yet coordinated parts serving one body (1 Corinthians 12:12–27), while the capacity for neuroplastic change invites moral responsibility for renewing the mind (Romans 12:2; Proverbs 4:23). Practically, understanding stable neurotransmitter identities undergirds personal wellbeing by informing evidence-based care for mood, cognition, and addiction, and it promotes societal health by guiding safe pharmacology, public mental-health strategies, and compassionate policies that respect both biological limits and human dignity.