2 Corinthians 5:17 & 2 Cor. 6:17

Elder Bednar said,
“The essence of the gospel of Jesus Christ entails a fundamental and permanent change in our very nature made possible through the Savior’s Atonement. True conversion brings a change in one’s beliefs, heart, and life to accept and conform to the will of God (see Acts 3:19; 3 Nephi 9:20) and includes a conscious commitment to become a disciple of Christ.

“… As we honor the ordinances and covenants of salvation and exaltation (see D&C 20:25), ‘press forward with a steadfastness in Christ’ (2 Nephi 31:20), and endure in faith to the end (see D&C 14:7), we become new creatures in Christ (see 2 Corinthians 5:17)” (“Converted unto the Lord,” Ensign or Liahona, Nov. 2012, 107).

2 Cor. 6:17
Elder Quentin L. Cook of the Quorum of the Twelve Apostles explained the need to separate ourselves from unrighteousness and the blessing that comes from doing so:

“The word saint in Greek denotes ‘set apart, separate, [and] holy’ [in Daniel H. Ludlow, ed., Encyclopedia of Mormonism, 5 vols. (1992), 3:1249]. If we are to be Saints in our day, we need to separate ourselves from evil conduct and destructive pursuits that are prevalent in the world.

“We are bombarded with visual images of violence and immorality. Inappropriate music and pornography are increasingly tolerated. The use of drugs and alcohol is rampant. There is less emphasis on honesty and character. Individual rights are demanded, but duties, responsibilities, and obligations are neglected. There has been a coarsening of dialogue and increased exposure to that which is base and vulgar. The adversary has been relentless in his efforts to undermine the plan of happiness. If we separate ourselves from this worldly conduct, we will have the Spirit in our lives and experience the joy of being worthy Latter-day Saints” (“Are You a Saint?” Ensign or Liahona, Nov. 2003, 95).