Why can you not do this perfectly? (Q261)
From To Be A Christian, An Anglican Catechism
While God made mankind to love him perfectly, sin has corrupted our nature, leading me to resist him, to ignore his will, and to care more for myself than for my neighbors. (Psalm 14:1; Romans 3:9-23; 7:21-25; 1 Corinthians 2:14)