We should not just speak because we have a mouth and a tongue. Jesus said that everyone will have to give account on the day of judgement for every empty word they have spoken. Our words can either save us or condemn us. On judgement day we will stand before the Lord and all our words will be laid bare to us, and God wouldn’t want excuses of what made you utter some undesirable words. If you entertain unwholesome talk or speak empty words, woe unto you. The mouth speaks what the heart is full of thus the words you speak reveal your character and personality.
Before I got born again, I did not really mind what I said to others. That is because my words actually showed the condition of my heart which was unrighteous before God. I tried to keep up with the latest slang words that often were vulgar. I used to curse and I was okay with it. If someone wronged me I wouldn’t hesitate abusing that person. It seemed cool to me at that time, however it worsened situations and sometimes led to fights. My relationships with other people deteriorated. But thanks be to Jesus who called me out of darkness and into his light. Nowadays, I try and speak what can only build others up. That is my motivation because Christ has changed my heart to be righteous before him. If that was not the case then I would continue speaking as I did before.
Your words are a picture to you to see if you’re saved or not. Someone who is truly saved has words of righteousness on the whole. Someone who is not saved does not have words of righteousness on the whole. You will know your status with Christ based on your words. So what are your words like?