To Hume, there were no logically necessary connections between causes and effects. Causes merely occur prior to and contiguous with effects. Hume further said that there is no uniformity of nature across time or space. As with the idea of causality, any such conclusion on the part of people is the result of habit and not something which is empirically verifiable. In Hume's view, science can make only historical statements about what has happened and can make no predictions about subsequent events.
Every new occurrence has the same probability as any other.
Hume suggested, however, that people should proceed as a matter of practical requirement to act as though past experiences can somehow be relevant to what may occur in the future. Kant realized that the science of Isaac Newton rested upon the objective principle of cause and effect. Kant saw this as a contradiction to the scepticism of Hume and believed that philosophy must choose between the two points of view. Kant sought to resolve this conflict by stating that the world exists only to the extent that humans participate in constructing it. The objects people observe are determined by the knowledge of those people rather than that knowledge being determined by the object.