The acclaimed author of the number one bestselling devotional My Utmost For His Highest is a product of the Keswick movement that preaches the Second Blessing or the Baptism of the Holy Spirit in addition to the initial salvation experience or initial evidence validation. I have perused his volume and can't help but notice a doctrinal error and hardly any reference to Scripture for his doctrinal assertions. For instance, he talks about "entire sanctification" on Jan. 15 and this refers to the end-product of Wesleyan perfectionism ("I have seen a limit to all perfection....") which is not orthodox to the mainstream of Protestantism and believes we can reach a spiritual state where we don't sin any longer "intentionally."
A Christian can be defined as one who has repented of his sins and is not practicing known sin intentionally, but if he sins he has an Advocate with the Father and intercession is made on his behalf. All sin is in some sense intentional or willful because we will it, but there is sin in some sense that is considered unintentional or original sin and cannot be helped, like a baby's selfishness. As long as we confess our sins God can forgive us; the important thing is to acknowledge it and move on and sincerely repent, even if we do it again God can forgive us; his grace is inexhaustible.
What is meant by intentional is open to debate, but the sacrifices of the Old Testament didn't cover intentional sins. Study Heb. 9:7 and Num. 15 about unintentional sin being atoned for (or sin by mistake). Psalm 19 talks about presumptuous sins and this is more likely the case because a mature Christian has learned not to take advantage of grace and test it for the sheer pleasure of it. 1 John 3:9 says: "No one born of God makes a practice of sinning...." Hebrews 10:26: "For if we go on sinning after receiving a knowledge of the truth there remains a sacrifice for sins, but a fearful expectation of judgment ["It is a fearful thing to fall into the hands of the living God."] and a fury of fire that will consume the adversaries." I do not wish to expound on this dogma but if you are so inclined to be a Wesleyan or Methodist, then Chambers is up your alley.
Another error is on Jan. 14 (cf. Matt. 22:14): "Many are called, but few are chosen," (cf. Matt. 22:14) means that only a few prove themselves to be chosen. What actually is the case is that the general call to salvation goes out to multitudes, but only the elect will obtain unto it (Rom. 11:7).
On Feb. 7 Chambers makes a dichotomy between salvation and discipleship. In reality, all believers are disciples and disciple was just one of the names they were originally known by before Christian became the moniker. He says, and I quote: "Discipleship has an option with it--if any man...." In summation, there are not two classes of believers or ranks of those baptized and not (1 Cor. 12:13 says we have all been baptized into the body, for example). We are all one in Christ! NB: Chambers is associated with the Keswick movement. Soli Deo Gloria!