The exact motives of both factions have not yet been revealed.

It was possible he had been hoping to frighten Steve, but his exact motives were unknown.

The exact motives of the Others remain unclear, save that they are fanatically dedicated to protecting the island at all costs.

The exact motive behind the assassination has never been fully revealed.

No one knows for sure the exact motives of the snake mongers.

His exact motives are unknown and can only be guessed at.

What his exact motives were, if indeed he knew them himself, I'm still uncertain.

Whatever the opportunist's exact motive, it always involves the element of selfishness.

Her exact motive is unclear, although his fiefs were confiscated.

Upon my word, I did not know, for on such occasions it is difficult to disentangle the exact motives of the heart.