1. In general, a fast is intended, (1.) For the honouring and pleasing of God. It must be such a performance as he has chosen (v. 5); it must be an acceptable day to the Lord, in the duties of which we must study to approve ourselves to him and obtain his favour, else it is not a fast, else there is nothing done to any purpose. (2.) For the humbling and abasing of ourselves. A fast is a day to afflict the soul; if it do not express a genuine sorrow for sin, and do not promote a real mortification of sin, it is not a fast; the law of the day of atonement was that on that day they should afflict their souls, Lev. xvi. 29. That must be done on a fast-day which is a real affliction to the soul, as far as it is yet unregenerate and unsanctified, though a real pleasure and advantage to the soul as far as it is itself.