My fellowship with my brethren who also believe in the Father and the Son, and hallow Their Names in spirit and in truth, gave me a deeper understanding of when to use these Names. These Names are holy, that probably no one on earth is worthy to ever use it. I consider myself unworthy as well, that I wanted to repent if there are times I used these in fruitless conversations.
When do we use The Name in vain?
We cannot use His Name when we curse, swear, or say bad words. (James 3:10; Matthew 15:10-11)
We cannot use His Name to mock or scoff people. (Proverbs 3:34; 19:29)
We cannot use His Name in anything that is not about worshipping Him. Remember, He is a jealous El. (Exodus 34:14)
We cannot vow (especially if we cannot, or we have no intention to fulfill it) using His Name. (Matthew 5:33-37, James 5: 12)
We cannot speak extra-biblical revelations using His Name. (Deuteronomy 4:2; 12:32; 13:1-10, Proverbs 30:5-6, Revelation 22:18-19)
We cannot mock Him (call Him evil, claim to be Him, deny Him, make Him an object of laughter). (Proverbs 3:34)
We cannot determine who He is or make Him in our own image. That's using His Name in vain too. (Proverbs 18:2, Numbers 23:19, Psalm 119:89)
We cannot come in His Name with bad intentions in our hearts. (Psalm 139:20)
We just cannot use His Name in anything fruitless, even in thoughts. (James 1:26, Matthew 12:36-37)
One of my brethren warned us about this; that it is better to address Him as Elohim or Heavenly Father than use His name (because it is holy).
Let us remember that we will be held accountable for whatever we say, especially when we use the name of our Elohim in whatever purpose. We have to be careful about our thoughts, our intentions, and our words. There is a special place for people who purposefully use His Name in vain, especially those who blaspheme the Name of the Holy Spirit, which is unforgivable.
Photo source: HalleluYAH Scriptures