As Paul continues his praise to God for the things God has done for the universal church, Paul mentions that God made Christians His heritage. Christians are the “things” which God has created, that in a figure of speech, are His “property,” His inheritance that will be “passed on” to the next generation (Ephesians 1:11, 12).
When one considers the word “inheritance,” it is most often thought of as being the money or property or both, which an individual receives after another person has died. Another word for inheritance is the word “heritage,” which is usually used to denote something of value that is passed down from previous generations. The point being is the “inheritance” is the “what” that is being passed down.