There are two ways to serve the Lord, only one of which actually renders service that He approves. One way is to have an intellectually correct view of what God requires and then to make an attempt to fulfill the requirements. The other way is to gain an equally correct view of what God requires and then tell Him that you cannot fulfill the requirements. The latter view is the proper one.
But, of course, it is not enough to tell the Lord that you can’t do what He requires. That, admission must be followed immediately by your acknowledgement that He can, and is willing to, enable you to do so by His Spirit, which in turn must be followed by your request for such help.
God blesses the humble, who acknowledge their own insufficiency. But He never takes that as an excuse for failing to meet His requirements. He has provided all we need for life and godliness, so no excuse is valid. On the other hand, we will not be given that for which we do not humbly ask.
So, a proper balancing of biblical truth is necessary: we cannot/we can—on our own/with His help. So, believer, in serving God, we serve well when we serve Him in our insufficiency fully aided by His sufficiency. Even Jesus, the all-sufficient One ministered under the power of the Holy Spirit. True godly service is that which involves both the human and the divine.