If you are giving your son a dollar to go to the movies as a gift, you give him the dollar without conditions.
If you want him to work for the dollar to get this pretend gift, it is not given freely by you, it is conditional.
Gods gift to us is unconditional.
Yes, faith is shown by works, as in the manifestations of my faith shows in my work.
Work however, is not required for Grace.
Work comes after Grace, not before or in conjunction with or required as Grace is unconditional.