3 Ways to Know What's True

When teaching Jesus Christ's gospel as a missionary, I soon get the question "how do you know if it's true."  I've come to expect this question and know so well what it can lead to, that I'm rather disappointed if it doesn't come up on it's own.  I've found that these are the three basic things that everyone should be doing to start finding the truth about God's plan and his relationship to us.

3 Ways to know spiritual truth

• Study the doctrine in the Holy Bible and Book of Mormon, as well as the words of modern prophets.
• Live the commandments, to see how they improve and bless your life. John 7:17
• Pray in faith and ask God in the name of Christ, if the message is true. James 1:5-6

What's happened as you've tried these three things?  Can you think of anything else that has helped you to confirm the truth about God's plan for us?

Doctrine and Covenants 1:37-38

Can anyone guess which language this is?  (Don't cheat and use something like Google Translate)
Here it is in English:

Search these commandments, for they are true and faithful, and the prophecies and promises which are in them shall all be fulfilled.
What I the Lord have spoken, I have spoken, and I excuse not myself; and though the heavens and the earth pass away, my word shall not pass away, but shall all be fulfilled, whether by mine own voice or by the voice of my servants, it is the same. [D&C 1:37-38]

It's a great scripture that I sent to a gentleman and a Saint in Slovenia, who chose despite great opposition from family and friends to follow the voice of the prophets and be baptized into Christ's reestablished Church.