Centuries later. French scientist and philosopher, Blaise Pascal wrote that "People [...] arrive at their beliefs not on the basis of proof, but on the basis of what they find attractive." Baruch Spinoza characterized emotions as having the power to "make the mind inclined to think one thing rather than another." Disagreeing with Seneca the Younger that emotion destroys reason, the 18th century Scottish philosopher George Campbell argued, instead, that emotions were allies of reason, and that they aid in the assimilation of knowledge. However, Campbell warned of the malleability of emotion and the consequent risk in terms of suggestibility: