Peter is commanded to come down from the roof and go to preach. Thus the Church contemplates the Lord not only in His ascent upward, but also as He descends to those below and, as it were, outside.
Yet they knock at the door of Simon, which signifies obedience.
The Church is to preach by returning to the active life, as though rising from a bed. Of this the Lord says: You will see heaven opened, and the angels of God ascending and descending upon the Son of Man, Jn 1:51.
His house, as was well mentioned above, was beside the sea, Acts 10:6. The sea signifies those driven by the waves of the confusion and storm of this age.
There wicked men, like greedy fish, pursue and devour one another.
But the saints have their citizenship in heaven, Phil 3:20. When the earthly house of this dwelling is destroyed, they have from God a dwelling in the heavens, a house not made with hands, eternal, 2 Cor 5:1.