Generally speaking, it is very difficult to directly prove the existence of causality because our eyes cannot look beyond this life for causes from the past lives and effects in the future lives. Nonetheless, through indirect means, as shown by the example above, it is possible to prove the link between cause and effect. Not only is samsara conditioned by causality, but also nirvana and liberation. Therefore, if it is liberation that we seek, we must plant the seed of liberation, which will then yield the fruit. Such is the view of Buddhism.
~ Depicted from Luminous Wisdom Book Series 1