Question: They come because they are invoked?

Sri Chinmoy: Most of the time angels have to be invoked. Again, many, many times they come without being invoked — they can come unconditionally. Usually people invoke angels unconsciously. Consciously, people think of God and then God may send an angel as His emissary.

From:Sri Chinmoy,Sri Chinmoy answers, part 25, Agni Press, 2000
Sourced from https://srichinmoylibrary.com/sca_25