There are many ways for Christians to do meditation: some are very simple but others are somewhat difficult; some require the use of the mind and knowledge, and there are those that require the use of memory, thought and will. Many have said that prayer is a work of the heart and a design of the heart, and that the heart reveals the whole human being to God. Catechesis on meditation in collaboration with P. Rasolofoniaina Olivier - S.J.