Jesus said that we can know the credibility of a ministry by their 'fruit', not by their 'gifts' (see Matthew 7:15-23). Gifts of the Spirit, as well as natural talent, are important but they are no evidence of a holy life. In fact, gifts can deceive us as to the true nature of a person. That's why character is to be the foundation of all ministry. 'Who we are' (fruit) is more important than 'what we can do' (gifts).
The interesting thing about gifts is that God gives them and doesn't take them back. Read this comment by Paul when writing to the believers at Rome …
"For God's gifts and his call can never be withdrawn." [Romans 11:29-30. NLT]
That means that a person can still continue to minister with the gifts God has given to them even when their character is not right. That's pretty scary because it enables people to abuse the grace of God – for a time.