They are abominable to the Lord. Willingness to obey. Hypocrites obey God grudgingly, and against their will. Willingly means joyfully, cheerfully and not with a long face and a moody attitude. The Lord wants to see his servants cheerfully obeying him and serving him.
Willingness is the heart and soul of obedience.
God sometimes accepts of willingness without the work, but never of the work without willingness. Obedience must be devoted to God in a fervent spirit. Obedience without fervency is like a sacrifice without fire. It is fervency that makes obedience acceptable to the Lord. Elijah's prayer fetched fire from heaven, because, being fervent, it carried fire up to heaven.