9 hea made known to us the mystery of his will according to his good pleasure, which he purposed in Christ,

Read Ephesians 1:9 Using Other Translations

Having made known unto us the mystery of his will, according to his good pleasure which he hath purposed in himself:
making known to us the mystery of his will, according to his purpose, which he set forth in Christ
God has now revealed to us his mysterious plan regarding Christ, a plan to fulfill his own good pleasure.