6 I am convinced and confident of this very thing, that He who has begun a good work in you will [continue to] perfect and complete it until the day of Christ Jesus [the time of His return].
We never stay in the same place in life, merely remaining static; we are always stepping into new levels. We do things we have never done before and face new responsibilities. We are presented with new opportunities, and many times they come with new opposition.
We have an enemy; the devil and he does not want us to make any kind of positive progress in life. The apostle Paul said in 1 Corinthians 16:9 that a wide door of opportunity had opened unto him and with it came many adversaries.
If God has promoted you to a new level of something or given you a new opportunity, you can be assured that He will guide and strengthen you for the challenge.
When opposition comes stands firm and be full of confidence because God is with you and you are more than a conqueror (see Romans 8:37).