Where to find scriptural help, regarding truth:
Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.
Sanctify them by the truth; your word is truth.
Then we will no longer be infants, tossed back and forth by the waves, and blown here and there by every wind of teaching and by the cunning and craftiness of men in their deceitful scheming. Instead, speaking the truth in love, we will in all things grow up into him who is the Head, that is, Christ.
Where to find scriptural help, regarding trust:
Trust in the LORD and do good; dwell in the land and enjoy safe pasture.
Delight yourself in the LORD and he will give you the desires of your heart.
Commit your way to the LORD; trust in him and he will do this
Trust in the LORD with all your heart and lean not on your own understanding; in all your ways acknowledge him, and he will make your paths straight.
Where to find scriptural help, regarding sincerity:
And this is my prayer: that your love may abound more and more in knowledge and depth of insight, so that you may be able to discern what is best and may be pure and blameless until the day of Christ.