"I think I don't regret a single 'excess' of my responsive youth - I only regret, in my chilled age, certain occasions and possibilities I didn't embrace"

This quote by Henry James speaks to the idea of living life to the fullest and not letting chances pass us by. He is reflecting on his youth, when he was more spontaneous and responsive, and how he does not be sorry for any of the "excesses" he may have indulged in. Rather, he is sorry for the celebrations and possibilities he didn't take advantage of. This suggests that he wants he had taken more risks and accepted more opportunities when he was younger. He is now in his "cooled age", and is reviewing his life with a sense of remorse for not having actually taken more chances. This quote motivates us to live life to the max and not let opportunities pass us by, as we may regret it later on. It is a tip to take dangers and accept the possibilities that life offers us.