The mixing and mingling of the holy with the unholy is a temptation God's followers still face today. It just doesn't work! Not because God is unreasonable in His demands, but because He knows such compromise will eventually destroy not only us, but everything He wants to do through us.
Whatever you allow into your life will eventually be revealed- both the good and the bad.
James 1:21- Therefore, get rid of all moral filth and the evil that is so prevalent and humbly accept the Word planted in you, which can save you.
Proverbs 14:12- There is a way that appears to be right, but in the end, it leads to death.
(adapted from Having a Mary Spirit by Joanna Weaver)