This dissertation deals with Adam Smith`s view on the nature of human activity, proposing an interpretation of this eighteenth century Scottish philosopher`s works on intellectual history and ethics. It is suggested that his philosophy is marked by a keen awareness of human imperfection and finitude. It demonstrates that Adam Smith`s thought is also, however, an effort of reconciliation with this essential imperfection. Smith`s reflection is directed to the task of showing how it would be possible for mankind, notwithstanding its limitations, to maintain a regular and harmonious existence and to advance from a cognitive, moral and material point of view. According to Adam Smith`s view, the human spirit is moved by a spontaneous and disinterested impulse to the realization of order, harmony and beauty in the different spheres of its activity. Nonetheless, although the spirit is naturally order- seeking, an absolutely symmetrical situation is never actualized because of the very imperfection of mankind. Such a situation wouldn`t even be bearable to human creatures. The first chapter has its analytical focus on an early text from Adam Smith`s called The History of Astronomy, and puts it into dialogue with the thought of David Hume. The subject here is how Smith, adopting Hume`s theory of imagination, partakes in the Humean project of a science of human nature. The second chapter discusses Adam Smith`s work on ethics, The Theory of the Moral Sentiments, and its central concept, sympathy.