Arcana Coelestia # 3237
3237. 'And her name was Keturah' means the essence of this Divine Truth. This is clear from the meaning of the word 'name' as the essential nature, and of 'calling by name' as knowing the essential nature, dealt with in 144, 145, 1754, 1896, 2009. Now because one does not speak of the nature of what is Divine but of the Esse of this, 'name' here means the essence, indeed the essence of Divine Truth - Divine Truth being meant here by 'the wife', to whom 'her' refers. For here 'the wife' means Divine Truth, see just above in 3236. From this it is evident what 'Keturah' in general embodies.
Arcana Coelestia # 341
341. Verse 2 And she bore again, his brother Abel. And Abel was a Shepherd of the flock, and Cain was a tiller of the ground.
The second born of the Church is charity, which is meant by 'Abel' and by 'brother. A shepherd of the flock' means one who practices good flowing from charity, while 'a tiller of the ground' means someone who, devoid of charity, acts from faith separated from love, which is not faith at all.