大毘盧遮那成佛經疏 11.26

11.26

The sūtra says: 'One should know that the effects of mantras are entirely free from causal karma.' This explains that a cause is a conditioned phenomenon; since the cause is conditioned, one should know that the effect is also conditioned. Since it is conditioned, how could it achieve reality? One should know that effects are free from causal karma.