1. Sincere sin·cere adjective
Free of deceit, hypocrisy, or falseness; earnest 
genuine; real
pure; unmixed;  unadulterated.

2. Our sincerity will affect our eternal destiny.
Paul prayed that the Philippians would “be sincere and without offense till the day of Christ” (Philippians 1:9-10)

3. Our Faith Must Be Sincere
“Now the purpose of the commandment is love from a pure heart, from a good conscience, and from sincere faith” (1 Timothy 1:5)

4. Our Brotherly Love must be Sincere
“Since you have purified your souls in obeying the truth through the Spirit in sincere love of the brethren, love one another fervently with a pure heart” (1 Peter 1:22)

5. The Opposite of Sincerity is Hypocrisy
“Woe to you, scribes and Pharisees, hypocrites! For you are like whitewashed tombs which indeed appear beautiful outwardly, but inside are full of dead men's bones and all uncleanness. Even so you also outwardly appear righteous to men, but inside you are full of hypocrisy and lawlessness.” (Matthew 23:27-28)

6. May the Worship we Offer the Lord Today be Sincere
“Sincerity is impossible, unless it pervades the whole being.” James Russell Lowell
“Praise the LORD! I will praise the LORD with my whole heart, In the assembly of the upright and in the congregation.” (Psalm 111:1)