The Law covenant was indeed a tutor leading to the Christ sir. Make no mistake not one individual who goes to heaven has not "worked" for God, in fact they are extremely zealous in their service to Jehovah otherwise they would not have been selected.
Jesus made it quite clear however, that doing, yes doing the will of Jehovah is essential in having a relationship with Him, and by our obedience to His laws we show our love for Him 1 Jn 5:3. You can accept the assignment or not, but if you choose not to, do not be surprised where you hear the words of Jesus echoed in your case: (Matthew 25:24-30) . . .“Finally the slave who had received the one talent came forward and said: ‘Master, I knew you to be a demanding man, reaping where you did not sow and gathering where you did not winnow. 25 So I grew afraid and went and hid your talent in the ground. Here, you have what is yours.’ 26 In reply his master said to him: ‘Wicked and sluggish slave, you knew, did you, that I reaped where I did not sow and gathered where I did not winnow? 27 Well, then, you should have deposited my money with the bankers, and on my coming I would have received it back with interest. 28 “‘Therefore, take the talent away from him and give it to the one who has the ten talents. 29 For to everyone who has, more will be given, and he will have an abundance. But the one who does not have, even what he has will be taken away from him. 30 And throw the good-for-nothing slave out into the darkness outside. There is where his weeping and the gnashing of his teeth will be.’
Jesus was the last Prophet under the Law of Old Covenant. He taught the Law in which this parable is an example.
When Jesus died on the Cross and rose from the dead, He ushered in a New Covenant in His Blood.
Grace came to man through the "doing" of Christ. He has fulfilled all the requirements of the Law for us by keeping it perfectly. By faith in Him we are granted by the Father the position of Law-keepers.
This parable is for us in the New Covenant an example of faithfulness, not doing, for Christ did the doing for us.
In the Covenant of Grace we are not called to "do." We are called to faithfulness as seen in this parable.
1 Tim. 6:12
"Fight the good fight of faith, lay hold on eternal life, whereunto thou art also called, and hast professed a good profession before many witnesses."
The calling is not "doing" it is "fighting the good fight of faith" in Christ. Holding on to that faith in Him.
"Fight the good fight of faith" is firmly holding on to faith in what Christ has done for us on the Cross.