A.T. Robertson Commentary Luke 11:13

"If ye then, being evil, know how to give good gifts unto your children, how much more shall [your] heavenly Father give the Holy Spirit to them that ask him?" — Luke 11:13 (ASV)

Know how to give (οιδατε διδονα). See on Mt 7:11 for this same saying. Only here Jesus adds the Holy Spirit (πνευμα αγιον) as the great gift (the summum bonum) that the Father is ready to bestow. Jesus is fond of "how much more" (ποσω μαλλον, by how much more, instrumental case).