"It is beyond a doubt that all our knowledge that begins with experience"

Immanuel Kant is specifying that all of our knowledge begins with personal experiences. He thinks that we can not obtain any understanding about the world or ourselves without first experiencing it. This understanding suggests that the structure of understanding is rooted in empirical evidence instead of conjecture or speculation. As such, the only way to gain real understanding is through a combination of observation, experimentation, and individual experience.