Is Christ everywhere?

In writing about the presence of Christ in the Eucharist, Martin Luther wrote:

See, the bright rays of the sun are so near you that they pierce into your eyes or your skin so that you feel it, yet you are unable to grasp them and put them into a box, even if you should try forever. Prevent them from shining in through the window—this you can do, but catch and grasp them you cannot. So too with Christ: although he is everywhere, he does not permit himself to be so caught and grasped; he can easily shell himself, so that you get the shell but not the kernel. Why? Because it is one thing if God is present, and another if he is present for you. He is there for you when he adds his Word and binds himself, saying, “Here you are to find me.” Now when you have the Word, you can grasp and have him with certainty and say, “Here I have thee, according to thy Word.” Just as I say of the right hand of God: although this is everywhere, as we may not deny, still because it is also nowhere, as has been said, you can actually grasp it nowhere, unless for your benefit it binds itself to you and summons you to a definite place. This God’s right hand does, however, when it enters into the humanity of Christ and dwells there. There you surely find it, otherwise you will run back and forth throughout all creation, groping here and groping there yet never finding, even though it is actually there; for it is not there for you.

So too, since Christ’s humanity is at the right hand of God, and also is in all and above all things according to the nature of the divine right hand, you will not eat or drink him like the cabbage and soup on your table, unless he wills it. He also now exceeds any grasp, and you will not catch him by groping about, even though he is in your bread, unless he binds himself to you and summons you to a particular table by his Word, and he himself gives meaning to the bread for you, by his Word, bidding you to eat him. This he does in the Supper, saying, “This is my body,” as if to say, “At home you may eat bread also, where I am indeed sufficiently near at hand too; but this is the true touto (note: touto is the Greek word for "this"), the ‘This is my body’: when you eat this, you eat my body, and nowhere else. Why? Because I wish to attach myself here with my Word, in order that you may not have to buzz about, trying to seek me in all the places where I am; this would be too much for you, and you would also be too puny to apprehend me in these places without the help of my Word.” (emphasis added)

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Luther, M. 1999, c1961. Luther's works, vol. 37 : Word and Sacrament III (J. J. Pelikan, H. C. Oswald & H. T. Lehmann, Ed.). Luther's Works. Vol. 37 (Vol. 37, Page 68-69). Fortress Press: Philadelphia