My Commands Are Not Too Hard For You
Synergists often cite Deut 30:11-14 to show that man can turn to God of his own natural capacities.
"For this commandment that I command you today is not too hard for you, neither is it far off. 12 It is not in heaven, that you should say, 'Who will ascend to heaven for us and bring it to us, that we may hear it and do it?' 13Neither is it beyond the sea, that you should say, 'Who will go over the sea for us and bring it to us, that we may hear it and do it?' 14But the word is very near you. It is in your mouth and in your heart, so that you can do it.
But as is the case in most error, they have not carefully read the passage for context. A few verses earlier the Lord says that our hearts first need to be circumcised by God's own hand for us to love him, which is what makes obedience possible. (Deut 30:6)
"And the LORD your God will circumcise your heart and the heart of your offspring, so that you will love the LORD your God with all your heart and with all your soul, that you may live."