The main feature should be the teaching of principles through stories. Don't make it metaphysical at all.

Our duty is to encourage every one in his struggle to live up to his own highest idea, and strive at the same time to make the ideal as near as possible to the Truth.

The ideal person is he who, in the midst of the greatest silence and solitude, finds the intensest activity, and in the midst of the intensest activity finds the silence and solitude of the desert.

See how the Ganga flows by and what a nice building! I like this place. This is the ideal kind of place for a Math. (in Belur, West Bengal).

As to the so-called Hindu idolatry - first go and learn the forms they are going through, and where it is that the worshippers are really worshipping, whether in the temple, in the image, or in the temple of their own bodies. First know for certain what they are doing - which more than ninety per cent of the revilers are thoroughly ignorant of - and then it will explain itself in the light of the Vedantic philosophy.

The Upanishads do not reveal the life of any teacher, but simply teach principles.

There cannot be two almighty beings in this world. [Imagine having] two or three Gods; one will create the world, another says, "I will destroy the world." It [can] never happen. There must be one God. The soul attains to perfection; [it becomes] almost omnipotent [and] omniscient. This is the worshipper. Who is the worshipped? He, the Lord God Himself, the Omnipresent, the Omniscient, and so on. And above all, He is Love. How is [the soul] to attain this perfection? By worship.