Marcus Aurelius Quote
Art thy not content that thou hast done something conformable to thy nature, and dost thou seek to be paid for it? Just as if the eye demanded recompense for seeing, or the feet for walking. For as these members are formed for a particular purpose... so also is man formed by nature to acts of benevolence.
IX, 42 - Meditations (c. 161–180 CE) - Book IX