2 Grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord; 3 seeing that His divine power has granted to us everything pertaining to life and godliness, through the true knowledge of Him who called us by His own glory and excellence. 4 For by these He has granted to us His precious and magnificent promises, so that by them you may become partakers of the divine nature, having escaped the corruption that is in the world by lust. 2 Peter 1:2-4 NASB
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 fully 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 had 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.