When a human being is suffering, people sometimes say: “He deserves his suffering and must bear his karma; if I help him, I am interfering with his karma.” This is nonsense; I know his poverty, his misery is caused through his earlier life, but if I help him, new entries will be made in his book of life; my help brings him forward.
It would be foolish to say to a merchant who could be saved from disaster by 1,000 or 10,000 Marks: “No, for that would alter your balance.” It is precisely this possibility of altering the balance that should induce us to help a man. I help him because I know that nothing is without its karmic effect. This knowledge should spur us on to purposeful action.
Source: Rudolf Steiner – GA 99 – Theosophy of the Rosicrucian – VII – The Technique of Karma – Berlin, May 31, 1907