There is nothing more important for life, even for material life, than the strong and sure realization of communion with the spiritual world.
If modern men had not lost their relationship with spiritual things to such an extent, these grave times would not have come upon us. Only a very few today have insight into this connection, although it will certainly be recognized in the future. Today men think: When a human being has passed through the gate of death, his activity ceases as far as the physical world is concerned. But indeed it is not so! There is a living and perpetual intercourse between the so called Dead and the so-called Living. Those who have passed through the gate of death have not ceased to be present; it is only that our eyes have ceased to see them. They are there in very truth.
Our thoughts, our feelings, our impulses of will, are all concerned with the Dead. The words of the Gospel hold good for the Dead as well; ‘The Kingdom of the Spirit cometh not with observation’ (that is to say, external observation); ‘neither shall they say, Lo here, lo there, for behold, the Kingdom of the Spirit is within you.’ We should not seek for the Dead through externalities but become conscious that they are always present. All historical life, all social life, all ethical life, proceed by virtue of co-operation between the so-called Living and the so-called Dead. The whole being of man can be infinitely strengthened when he is conscious not only of his firm stand here in the physical world but is filled with the inner realization of being able to say of the Dead whom he has loved: They are with us, they are in our midst.
Source: Rudolf Steiner – GA 182 – The Dead Are With Us – Nuremburg, 10th February 1918