Integrity is a concept of consistency of actions, values, methods, measures, principles, expectations, and outcomes. In ethics, integrity is regarded as the honesty and truthfulness or accuracy of one's actions. Integrity can be regarded as the opposite of hypocrisy, in that it regards internal consistency as a virtue, and suggests that parties holding apparently conflicting values should account for the discrepancy or alter their beliefs.

The word "integrity" stems from the Latin adjective integer (whole, complete). In this context, integrity is the inner sense of "wholeness" deriving from qualities such as honesty and consistency of character. As such, one may judge that others "have integrity" to the extent that they act according to the values, beliefs and principles they claim to hold.

A value system's abstraction depth and range of applicable interaction may also function as significant factors in identifying integrity due to their congruence or lack of congruence with observation. A value system may evolve over time while retaining integrity if those who espouse the values account for and resolve inconsistencies.

Abraham Lincoln ⁱ/ˈeɪbrəhæm ˈlɪŋkən/ (February 12, 1809 – April 15, 1865) was the 16th President of the United States, serving from March 1861 until his assassination in April 1865. He successfully led his country through its greatest constitutional, military and moral crisis – the American Civil War – preserving the Union while ending slavery, and promoting economic and financial modernization. Reared in a poor family on the western frontier, Lincoln was mostly self-educated. He became a country lawyer, a Whig Party leader, Illinois state legislator in the 1830s, and a one-term member of the United States House of Representatives in the 1840s. After a series of debates in 1858 that gave national visibility to his opposition to the expansion of slavery, Lincoln lost a Senate race to his arch-rival Stephen A. Douglas. Lincoln, a moderate from a swing state, secured the Republican Party nomination. With almost no support in the South he swept the North and was elected president in 1860. His election was the signal for seven southern slave states to declare their secession from the Union and form the Confederate States of America. The departure of the Southerners gave Lincoln's party firm control of Congress, but no formula for compromise or reconciliation was found. And the war came.

Richard Duane "Rick" Warren (born January 28, 1954) is an American evangelical Christian minister and author. He is the founder and senior pastor of Saddleback Church, an evangelical megachurch located in Lake Forest, California, currently the eighth-largest church in the United States (this ranking includes multi-site churches). He is also a bestselling author of many Christian books, including his guide to church ministry and evangelism, The Purpose Driven Church, which has spawned a series of conferences on Christian ministry and evangelism. He is perhaps best known for the subsequent devotional The Purpose Driven Life which has sold over 30 million copies, making Warren a New York Times bestselling author.

Warren holds conservative theological views and holds traditional evangelical views on social issues such as abortion, same-sex marriage, and embryonic stem-cell research. Warren has called on churches worldwide to also focus their efforts on fighting poverty and disease, expanding educational opportunities for the marginalized, and caring for the environment. During the 2008 United States presidential election, Warren hosted the Civil Forum on The Presidency at his church with both presidential candidates, John McCain and Barack Obama. Obama later sparked controversy when he asked Warren to give the invocation at the presidential inauguration in January 2009.