Thomas Boston, Works, 1:551:
Faith in Christ is the great comprehensive gospel-duty. Many have mean thoughts of faith in comparison of other duties. But the scripture gives it the preference, John 6:29; 1 John 3:23. When we bid you believe, we bid you get all privileges, and do all duties; for believing is the way to both, in so far as it unites the soul to Christ, which is the fundamental privilege of the saints. If ye believe, ye do all in effect, as he who takes hold of the first link of a chain has hold of all the links. If ye believe not, ye do nothing; for without faith ye are without Christ, and without Christ ye can do nothing, John 15:5, compare Heb. 11:6.
Faith in Christ is the great comprehensive gospel-duty. Many have mean thoughts of faith in comparison of other duties. But the scripture gives it the preference, John 6:29; 1 John 3:23. When we bid you believe, we bid you get all privileges, and do all duties; for believing is the way to both, in so far as it unites the soul to Christ, which is the fundamental privilege of the saints. If ye believe, ye do all in effect, as he who takes hold of the first link of a chain has hold of all the links. If ye believe not, ye do nothing; for without faith ye are without Christ, and without Christ ye can do nothing, John 15:5, compare Heb. 11:6.