Passage
even them will I bring to my holy mountain, and make them joyful in my house of prayer; their burnt-offerings and their sacrifices shall be accepted upon mine altar: for my house shall be called a house of prayer for all the peoples.
even them will I bring to my holy mountain, and make them joyful in my house of prayer; their burnt-offerings and their sacrifices shall be accepted upon mine altar: for my house shall be called a house of prayer for all the peoples.
Isaiah 56:5 even unto them will I give in my house and within my walls a place and a name better than of sons and daughters; I will give them an everlasting name, that shall not be cut off.
Isaiah 56:6 Also the sons of the alien, that join themselves to Jehovah, to minister unto him and to love the name of Jehovah, to be his servants, every one that keepeth the sabbath from profaning it, and holdeth fast to my covenant;
Isaiah 56:7 even them will I bring to my holy mountain, and make them joyful in my house of prayer; their burnt-offerings and their sacrifices shall be accepted upon mine altar: for my house shall be called a house of prayer for all the peoples.
Isaiah 56:8 The Lord Jehovah, who gathereth the outcasts of Israel, saith: Yet will I gather [others] to him, with those of his that are gathered.
Isaiah 56:9 All ye beasts of the field, come to devour, all ye beasts in the forest.
The verse centers on "called", "even", "bring", "holy", "mountain", "make", "joyful", and "house". It is saying that the verse draws attention to "called" and "even", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 6's "Also the sons of the alien that..." into verse 8's "The Lord Jehovah who gathereth the outcasts...", so "called" and "even" belong inside that flow. In Isaiah context, the local focus is the Holy One of Israel, judgment and restoration, the servant of the LORD, and Zion's hope.
A plain takeaway is to answer the verse's own emphasis on "called" and "even" with trust shaped by these words, not by a vague optimism outside the passage.