a doer of good的用法和样例：
- To be both a speaker of words and a doer of deeds.
- He was not just a hearer but a doer of his Father's will.
- It may be ill with the doer of good as long as the good ripens not.
- As kinsmen welcome a dear one on arrival, even so his own good deeds will welcome the doer of good who has gone from this world to the next.