Maybe it's a guy thing, this reluctance to explain his motives.

Ed needs to explain his motives, sounds to me like a Thatcher mark 2).

They were at a loss to explain his motives.

I shouldn't want to be the one to explain your motives for helping me.

Public outrage quickly turned to a chorus of sympathy when she explained her motives.

There was no way he could explain to her his motives.

The latter may better explain her motives than the former.

The pause was natural enough, for, even to himself, he could hardly have explained all his motives.

Ambassador Martin ignored much of the blame, and did so without feeling the need to explain his motives to the media.

During a series of recent conversations, Wright responded to these charges and explained his motives.