We, as members of our temple, should make great effort to fulfil our mission,as received fromour High Priest .
Are there any errors in the sentence, especially in regard to the bold part? I think it should be ‘the mission given to us by our High Priest’ instead?
I think either version is grammatically correct. The original sentence focuses more on the members, who receive the mission and then fulfill it - the High Priest is somewhat secondary in this version. Your edit puts a little more focus on the High Priest - it is a two step process with the High Priest doing the giving and the members taking care of the fulfillment.