In my homily this weekend I quoted a homily by St Bernard. You can read more of St Bernard's words here.
These few words give us a flavour:
In his first coming our Lord came in our flesh and in our weakness; in this middle coming he comes in spirit and in power; in the final coming he will be seen in glory and majesty.
In case someone should think that what we say about this middle coming is sheer invention, listen to what our Lord himself ways: If anyone loves me, he will keep my word, and my Father will love him, and we will come to him.