When we live our lives not for vanity, but for the sake of God and the betterment of humanity, that's what gives us immortality.
Fidel Castro was a revolutionary spirit from the practical spiritual side of it, but not with "religiosity"; not with prayer and fasting and charity in that sense, but he gave it all, to make humanity better.
During the fast of Ramadan, our minds stayed on the worship of Allah and stayed on the remembrance of the great gift to humanity of the Qur'an must mean then that following that sacredness of the Qur'an should be our actions in accord with what the Qur'an and Allah demands of the believer especially during this Sacred Month.