Hey, I can relate to this side of the spectrum as well - what is spiritual power?
how about the capability of well balanced fullness of self that can calmly withstand the onslaught of the chaotic external phenomena in all conditions. It has absolutely nothing to do with religion and it is totally within the dimension of it is what it is now.
In harmony there is nothing to withstand.
The secret of Aikido is that there is no power.