Because success or failure is not more important than doing what God has called you to do.
When you follow what God wants you to do, He is going to turn your failures for your good. The stone you stumble at, is going to be the stepping stone.
Some results take time. You don’t see them overnight. That is why you cannot measure your success with the results you see. Just focus on doing what God has called you to do.
And oh, critics or fans don’t matter as well!
The key is to
– not quit (don’t be discouraged),
– get better at it at heart and mind “daily”,
– and douse yourself in the Word and prayer.