This quote by Barbara Castle speaks with the value of courage and determination in the political arena. It suggests that having the courage to defend what you think in and the determination to see it through is necessary for success in politics. It indicates that having a strong moral compass and the determination to take risks is required to make a difference in the political landscape. It likewise implies that having the guts to defend what you believe in, even when it is out of favor, is important for success in politics. This quote is a tip that having the guts to stand up for what you believe in and the decision to persevere is vital for success in politics.