A more thorough explanation:

sicut me Deus adjuvet

sicut me Deus adjuvet means "So help me God" in Latin. It is a phrase that is often used in legal or official situations to show that someone is making a solemn promise or oath.

• When the president takes the oath of office, he says "I do solemnly swear that I will faithfully execute the Office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States." Then he ends with "So help me God."
• In court, witnesses are often asked to swear to tell the truth by saying "Do you swear to tell the truth, the whole truth, and nothing but the truth, so help you God?"

These examples show how the phrase "sicut me Deus adjuvet" is used to emphasize the seriousness of a promise or oath. By invoking God's help, the person is showing that they understand the importance of keeping their word and will do everything in their power to fulfill their obligations.