Ignatius preaches against the ongoing issue of Gnosticism: that all that matters is the spiritual and quietism and spirituality, and not any practical good or outworking of holiness.
We do good not because this earns us salvation. That work is completed: we do good so that the sickness of the world is minimized, and we may be cured in this life.
Using the patristics project for the text.
For some are in the habit of carrying about the name[of Jesus Christ] in wicked guile, while yet they practise things unworthy of God, whom ye must flee as ye would wild beasts. For they are ravening dogs, who bite secretly, against whom ye must be on your guard, inasmuch as they are men who can scarcely be cured. There is one Physician who is possessed both of flesh and spirit; both made and not made; God existing in flesh; true life in death; both of Mary and of God; first possible and then impossible, even Jesus Christ our Lord.
Let not then any one deceive you, as indeed ye are not deceived, inasmuch as ye are wholly devoted to God. For since there is no strife raging among you which might distress you, ye are certainly living in accordance with God’s will. I am far inferior to you, and require to be sanctified by your Church of Ephesus, so renowned throughout the world. They that are carnal cannot do those things which are spiritual, nor they that are spiritual the things which are carnal; even as faith cannot do the works of unbelief, nor unbelief the works of faith. But even those things which ye do according to the flesh are spiritual; for ye do all things in Jesus Christ.
Nevertheless, I have heard of some who have passed on from this to you, having false doctrine, whom ye did not suffer to sow among you, but stopped your ears, that ye might not receive those things which were sown by them, as being stones of the temple of the Father, prepared for the building of God the Father, and drawn up on high by the instrument of Jesus Christ, which is the cross, making use of the Holy Spirit as a rope, while your faith was the means by which you ascended, and your love the way which led up to God. Ye, therefore, as well as all your fellow-travellers, are God-bearers, temple-bearers, Christ-bearers, bearers of holiness, adorned in all respects with the commandments of Jesus Christ, in whom also I exult that I have been thought worthy, by means of this Epistle, to converse and rejoice with you, because with respect to your Christian life ye love nothing but God only.
Letter of Ignatius to the Ephesians