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Heavenly Father is not expecting you to become completely perfect in this life. He knew His children would make mistakes as they learned from experience in mortality. But “God so loved the world” 18 that His plan of happiness provided a merciful Savior.
If I were to ask which of the Lord’s commandments is most difficult to keep, many of us might cite Matt. 5:48: “Be ye therefore perfect, even as your Father which is in heaven is perfect.” 1
Keeping this commandment can be a concern because each of us is far from perfect, both spiritually and temporally. Reminders come repeatedly. We may lock keys inside the car, or even forget where the car is parked. And not infrequently we walk intently from one part of the house to another, only to forget the reason for the errand.
Link to the complete message - Perfection Pending by Russell M. Nelson