2 May grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord. 3 His divine power has granted to us all things that pertain to life and godliness, through the knowledge of him who called us to his own glory and excellence, 4 by which he has granted to us his precious and very great promises, so that through them you may become partakers of the divine nature, having escaped from the corruption that is in the world because of sinful desire. 2 Peter 1:2–4, ESV
The root of most heresies springs from those who profess Christ as Saviour, but who believe in various ways that what the Christian receives at Salvation is not sufficient. Something else must be added in order for the Christian to enter into a fuller relationship with God or to go deeper into the things of God. Some even go so far as to say that unless certain things are added to salvation then it is not complete and, therefore, void. A good example of this is found in the book of Galatians. Some Judiazers had entered the churches Paul and planted in Galatia. They were teaching that salvation was indeed by Christ, but it was not complete unless the converts also were circumcised and kept the Law of Moses.