One man's ambition is not another's ambition, nor will the same event or object satisfy both; but the humanity of one man is the humanity of every one, and the same object touches this passion in all human creatures.
 David Hume, An Enquiry Concerning the Principles of Morals (1751). copy citation

Context

“And though this affection of humanity may not generally be esteemed so strong as vanity or ambition, yet, being common to all men, it can alone be the foundation of morals, or of any-general system of blame or praise. One man's ambition is not another's ambition, nor will the same event or object satisfy both; but the humanity of one man is the humanity of every one, and the same object touches this passion in all human creatures. But the sentiments, which arise from humanity, are not only the same in all human creatures, and produce the same approbation or censure; but they also comprehend all human creatures; nor is there any one whose conduct or character is not, by their means, an object to every one of censure or approbation.” source