clean conscience
judge you as an apostate and will not, unless by word or deed you make it known that it is so.
profit materially from one another, if we are unable do the same spiritually.
If in time, circumstance are such that its necessary to do that, I will.
We found out that he was soliciting work in the same field with the same name...
(1) Clean conscience - what is this supposed to mean in this context?
It implies one of you is "dirty" ? and that would not be him.
(2) When he solicitated work under your Reputation and Brand name,
and Good Will, that was your Intellectual Property, was he having this "clean conscience" ?
(3) His reasoning is : to profit materially we must agree "spiritually" or religiously ?
And how does this work across the board for Jehovah's Witnesses in all forms of work ?
(4) Is there a contractual agreement of any kind between you and your brother ?
Something in writing to define his status as employee ? Not a partner or owner ?
Religion aside, you have legal rights, go see a lawyer who specailizes in business law,
or at least get some books on business law in your State.