Convictions Leads to Spiritual Growth
And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God. (Romans 12:1)
A person without conviction is at the mercy of circumstances. If you don't determine what's important and how you'll live, other people will determine it for you.
A person without conviction is a weak, jellyfish type of individual who mindlessly follows the crowd.
Conviction helps us be diligent in continuing to grow spiritually. Growth requires time and effort. Without convictions about growth, people become discouraged and give up. No one stays with a difficult task unless he is convinced that there is a good reason for doing it. A church can teach people how to pray, how to study the Bible, and how to witness, but without imparting the corresponding convictions, people will not stick with it.
Knowing what to do (knowledge), why to do it (perspective) and how to do it (skill) is worthless if you don't have the conviction that will motivate you to actually do it!