I recently read this section in the first chapter of Preach My Gospel, and wanted to share it. I've edited it to apply to members who are not serving full-time missions:
A Successful Missionary
Your success as a missionary [or member, or person, or anything] is measured primarily by your commitment to find, teach, baptize, and confirm people and to help them become faithful members of the Church who enjoy the presence of the Holy Ghost.
Avoid comparing yourself to other [people] and measuring the outward results of your efforts against theirs. Remember that people have agency to choose whether to accept [you or who you are or the things that you do and represent]. Your responsibility is to teach clearly and powerfully so they can make a correct choice. Some may not accept your message [or agree with you] even when they have received a spiritual witness that it is true. You will be saddened because you love them and desire their salvation. You should not, however, become discouraged; discouragement will weaken your faith. If you lower your expectations, your effectiveness will decrease, your desire will weaken, and you will have greater difficulty following the Spirit.
You can know you have been a successful [person] when you:
• Feel the Spirit testify to people through you.
• Love people and desire their salvation.
• Obey with exactness.
• Live so that you can receive and know how to follow the Spirit, who will show you where to go, what to do, and what to say.
• Develop Christlike attributes.
• Work effectively every day, do your very best to bring souls to Christ, and seek earnestly to learn and improve.
• Help build up the Church (the ward) wherever you are assigned to work.
• Warn people of the consequences of sin. Invite them to make and keep commitments. [This is harder when you're not a missionary or a prophet, but can include speaking out to family members, and extending commitments to others you are involved with, such as those you visit/home teach.]
• Teach and serve other missionaries.
• Go about doing good and serving people at every opportunity, whether or not they accept your message [or service].
When you have done your very best, you may still experience disappointments, but you will not be disappointed in yourself. You can feel certain that the Lord is pleased when you feel the Spirit working through you.
Isn't that a great message? I love it. Don't get discouraged. Success is measure by commitment. That applies to so many aspects of my life, not just the gospel.