Paul and Silas chose to Praise and not complain because their praise was from the heart and not about themselves. Suddenly happened and salvation was the result. 

Even in the darkest most dangerous and difficult times Paul knew that it always best to offer Praise to the Lord. 

Jesus asked the disciples a question, who do they say I am? Then he followed that question up with another question, who do YOU say I am. It really doesn’t matter at all who others say He is, it only matters who you say He is.