Treasury of Scripture Knowledge

Summary

For there must be also heresies among you, that they which are approved may be made manifest among you.

Bible References

There

Matthew 18:7
"It will be too bad for the world because of occasions that cause people to fall away [from God]! For it is inevitable that such occasions come, but it is too bad for that person who is responsible for causing it to happen.
Luke 17:1
Then Jesus said to His disciples, "It is inevitable that occasions which cause people to be led astray [from God] will come, but it is too bad for that person who is responsible for it happening.
Acts 20:30
[Indeed, even] from among your own selves [i.e., the body of elders there in Ephesus] some men will arise and, by speaking false things, they will lead away the disciples, [influencing them] to follow them.
1 Timothy 4:1
Now the Holy Spirit specifically says that in later times [Note: "Later times" in the New Testament usually refers to the period following the first coming of Christ and the establishment of the church], some people will fall away from the faith [i.e., the true teaching of Christianity]. They will pay attention to deceitful spirits [i.e., lying people] and the teaching of evil spirits.
2 Peter 2:1
But just as there were false prophets among the people before, there will also be false teachers among you [Christians]. They will privately teach harmful doctrines that destroy people [spiritually], by even denying [that Jesus is] the Master, [and thereby] destroying themselves quickly.

Which

Luke 2:35
and thus reveal the thoughts of many hearts. Yes, and a sword will cut you [Mary] to the heart [i.e., causing you inward pain]."
2 Corinthians 13:5
Put yourselves to a test; see if you are [really] in the faith [i.e., see if you are genuine Christians]; examine yourselves! Or, do you not realize that Jesus Christ is in your hearts, unless [of course] you fail the test [i.e., unless you are counterfeit Christians].