Larger context for LACK in Corpus USbrown_UKbncw/US_brown.txt
"The best condition of it would be an open conflict and rivalry of the diverse systems ....
The world might ring with the struggle, if we devoted ourselves exclusively to belaboring each other".
lack > The "belaboring" is of course jocular, yet James was not lack ing in fundamental seriousness- unless we measure him by that ultimate seriousness of the great religious leader or thinker who stakes all on his vision of God.
To James this vision never quite came, despite his appreciation of it in others.
But there is a dignity and even a hint of the inspired prophet in his words to one correspondent "You ask what I am going to 'reply' to Bradley.
But why need one reply to everything and everybody? ...
I think that readers generally hate minute polemics and recriminations.