Proverbs 4:23-24

Watch over your heart with all diligence, for from it flow the springs of life. Put away from you a deceitful (lying and misleading) mouth, and put devious lips far from you.

It matters what we let into our minds and what we let out of our mouths. If we are not at peace and unsettled, check in on what we are thinking and what we are saying. When we test our current situation, and if it is negative, then we need to test our conversation with ourselves and others. We have the greatest impact on our future by what we speak about today.