Justification, of course, has no degrees and is completed at one moment and in only one act. Yet, in manifestation, consciousness, and effects it has many degrees.The Marrow of Theology, 161
Faith is a resting of the heart on God, as on the author of life and eternal salvation. That is to say, that by him we may be freed from all evil, and obtain all good.https://www.monergism.com/faith-2
For the church is a company of men that are called (1 Cor. 1:24; 10:32), both Jews and Greeks, to the Jews, to the Greeks, and to the church of God. But because the end of calling is faith, and the work of faith is engrafting into Christ, and this union with Christ does bring with it communion with Christ. Hence it is defined, in the very same sense, a company of believers, a company of those who are in Christ, a company of those that have communion with Christ.
The first act of religion, therefore, concerns those things which are communicated to us from God. The other concerns those things which we yield to God.