He that overcometh - See the notes on Revelation 2:7.
Shall inherit all things - Be an heir of God in all things. See the notes on Romans 8:17. Compare Revelation 2:7, Revelation 2:11, Revelation 2:17, Revelation 2:26; Revelation 3:5, Revelation 3:12, Revelation 3:21.
And I will be his God - That is, forever. He would be to them all that is properly implied in the name of God; he would bestow upon them all the blessings which it was appropriate for God to bestow. See the 2 Corinthians 6:18 note; Hebrews 8:10 note.
And he shall be my son - He shall sustain to me the relation of a son, and shall be treated as such. He would ever onward sustain this relation, and be honored as a child of God.