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Recently I saw a discussion online about why people who create fantasy worlds continue to use Latin and Latin-esque words in their stories. It was pointed out that the reason why is because people associate Latin sounding words with glory, grandeur, and a sort of ancient splendor. One person was skeptical, asking how people could think that after the empire that first used Latin, the Roman Empire, fell. It does seem odd, but Latin has been used in the Catholic Church for liturgical purposes for centuries, and Latin is still used in scientific circles for many things. In fact, Isaac Newton first laid out his laws of motion in a treatise he called Philosophiæ Naturalis Principia Mathematica (usually shortened to just Principia). It was written entirely in Latin, and was published in 1687, 1200 years after the fall of Rome.

So, writing your New Year's Resolutions not only in stone, but also in Latin, would definitely lend an air of importance to them. I don't know if that would make you more likely to keep them, though.