The apostle implies that, if they could do it, why can we not do as well, since the same factors that existed for them are still working? Namely, God is still on His throne, and His truth stands firm. We should desire to please and trust no one else in the entire world above God. This is an important point regarding faith because this faith must be lived toward God.
Remember, God as a personal Being and His message given through Jesus Christ are the objects of our trust. It is easy for our attitude to be oriented toward pleasing other people. God does not deny this to us, but pleasing Him must dominate our attitude. We must choose pleasing Him as the primary desire of our lives, or conviction has little chance of growing.