Proverbs 11:30 reads “Whoever captures souls is wise.” Does that mean a person is prudent to spend time in witnessing? Or does it teach us that when we succeed in winning souls we show ourselves to be wise or skillful in that activity? We will let you decide.
Sincerity is a virtue found in both sinners and saints. You cannot be saved if you are not sincere, but no one is ever saved simply by being sincere. Sincerity is a good quality to cultivate, but it will not make you righteous before God. Sincerity means you act without any pretense or hypocrisy according to the standards you have been taught and have accepted. Those standards may be right, partly right or altogether wrong.