Phil1:10

When we approve and receive the things that are excellent, we become sincere (speaking of inner righteousness) and without offense (speaking of outer righteousness that can be seen). Till the day of Christ means that these things become increasingly evident in our life until Jesus comes.

i. Being sincere is important, but alone it is not enough. Notorious sinners in the days of Jesus such as tax collectors were sincere, but still needed to repent. As well, being without offense before others is important, but alone it is not enough. The Pharisees of Jesus' day were without offense in the opinon of many. We want God to make us both sincere and without offense.