“But the high places were not removed from Israel; nevertheless Asa’s heart was blameless all his days.” – 2 Chr. 15:17
Asa, like us, had his blemishes, but his heart was right with God.
Thomas Watson said, “Men judge the heart by the actions, God judges the actions by the heart.” (1 Sam. 16:7 “The Lord lookers upon the heart.”)
God bears with our MANY failings.
Another way to say it would be: God uses flawed people because that is all He has to pick from.