首楞嚴義疏注經 3.433

3.433

此轉破也。若不見空出土入井，則土因空果二無有異，土即是空、空即是土，土出井時，何不見空從井而出？

This is a shifting refutation. If one does not see space leave the soil and enter the well, then the cause (soil) and the effect (space) have no difference; soil is space and space is soil. When the soil came out of the well, why did one not see space come out of the well?