Hṛdayānanda: "As the embodied soul continually passes in this body from boyhood to youth to old age, the soul similarly passes into another body at death."
Prabhupāda: That's it. Now, this is a fact. Everyone knows that body is changing. Now, how the last body's changed? That you make experiment, how it is passing. Yes. To make experiment means you have to know the science how to make experiment. That is knowledge. You take the basic principle of knowledge, and then you make your experiment and you will know this is perfect.