He does not use expressions belonging to seeds, such as sprouting, growing, rotting, or decaying. Rather, he introduces words corresponding to our flesh: 'It is not made alive unless it dies,' which is proper not to seeds, but to bodies.
And he did not say, 'It will live after it dies,' but something stronger: that it lives because it dies. The very thing from which others drew a conclusion against the resurrection, he turns into proof of the resurrection.
In a similar way Christ clearly shows the same thing when He says, 'Unless a grain of wheat falls into the earth and dies, it remains alone; but if it dies, it bears much fruit' (Jn 12:24)."
Then, explaining the inner meaning of this comparison, St. John Chrysostom says, "We sow a naked grain. From it afterward a new ear with new wheat is born again.
The question is how this ear relates to the grain that was sown. It is the same as it, and not the same. It is the same because it is of one essence with the grain. It is not the same because it is better.
The essence remained the same, but greater beauty appeared, and it rose in a new form. So also the future body will be the same, but will appear in a more perfect form."
The Apostle answers further what exactly will be better in our future body.