Human deliberation is a complicated and a difficult process. When forming moral judgement, various reasons inclinate the agent without necessitating him or her and the final result is more or less a compromise between these different spurs for action. Choosing right requires clear mind, good habits and strength of will. However, by a kind of self-manipulation moral development is possible. In my presentation, I shall discuss the forming of moral judgement in the intellect, consider the role of the passions in deliberation and discuss how moral self-improvement takes place according to Leibniz in Nouveaux essais and Animadversiones in partem generalem Principiorum Cartesianorum.