Unevenly yoked dating
It was not just a legalism, but an attempt to live out in all aspects of life what they understood to be God's purposes for his world that he had created.
Paul, trained Pharisee that he was, no doubt well understood all this and applied this principle in addressing the church at Corinth (2 Cor ).
Paul maintained that we have freedom in Christ, that relationship with God is not a matter of obeying law but of the motivation of love from the heart.
Yet some Corinthians had taken that to the point of maintaining that nothing they did mattered since they were free from the law (cf. This was easier to do in the environment of Corinthian Greek culture that, following Plato, assumed that the physical world was irrelevant and unimportant since the only true reality was spirit, the "inner" person (see Body and Soul: Greek and Hebraic Tensions in Scripture).
Practically, this could apply to a lot of areas of life, but not as a rigid law.
It is a matter of ethics that must come from the freedom in Christ that Paul makes clear.
In other words, what they did ethically mattered a great deal if they were claiming to be Christians.
Here is the entire passage from which this verse is taken (2 Cor -18): 14 Do not be mismatched with unbelievers.
For what partnership is there between righteousness and lawlessness? 16 What agreement has the temple of God with idols?
It can cause Christians to compromise, there will be disagreements, etc. You can easily be led astray and hinder your relationship with Christ.
Don’t think that you will get married and you will change them because that rarely happens and it will most likely cause more problems.