Many people may disdain when they hear the name of spiritual science. The spirituality of MahaManas is rational/ reasonable spirituality, free from superstition ~ blind-faith. This spirituality is not conventional religious spirituality.
The essence of true spirituality is to know oneself, to know this 'I'. In order to know oneself or the 'I' properly, one has to know the universe of which this 'I' is a part, that is, the cosmic order. You have to know the truth of creation, then you will be able to know the mystery of the creation of this 'I'.
The main goal of spirituality is to find the root and root cause of creation along the path of reasoning with a free mind. As you continue on this path, the cosmic mysteries will gradually unfold to you. There is no difference between science.