As the other poster mentions, "Life, liberty and the pursuit of happiness" is not from the Constitution but from the Declaration of Independence. As much as it might be part of American civic lore, the Declaration of Independence is not legally binding, it is a product from two whole legal regimes before the USA's current one was founded.

The current court has made it clear "civic lore" is fundamental to interpreting the Constitution, though curiously this seems to only apply to certain causes.