Giving no offence in any thing, that the ministry be not blamed:
We put no obstruction in anybody's way [we give no offense in anything], so that no fault may be found and [our] ministry blamed and discredited.
giving no occasion of stumbling in anything, that our ministration be not blamed;
We don’t give anyone any reason to be offended about anything so that our ministry won’t be criticized.
May we never give offense to anyone, so that our ministry may not be disparaged.