hm..yoshiki most notable words are tears,memory,dream,love,pain..
but most of his ballads use words tears,love and dream for it lyrics..
and now I'm knowing why yoshiki composed endless rain..
I don't think it's difficult to figure it out.
It's anyways the same in most of his lyrics: Kurenai, Unfinished, Week End, Rain (performed by Glay), Silent Jealousy, Say Anything... and so on...
And may be in the indies-days much more with hate in it... in example No Connexion
And there are several symbols which return again and again: blue, red, blood, tears, walls, rain, night...