The fourth aspect is the form of worship. The forms of worship of all the different religions are necessarily different; it depends upon what one is accustomed to, what is akin to one's nature. One cannot make a common rule and say that this form is wrong and that form is right. One person will perhaps feel more exaltation in a form of worship which includes some art; it stimulates his emotional nature. Music, pictures, perfumes, colors, light, all these have an effect upon such a person. Another can concentrate better if there is nothing in the place of worship to catch his attention. It is all a matter of temperament; it is not wrong to prefer the one or the other. The Sufi sees the variety of forms as different ideals; he does not attach importance to the outer expression. If there is a sincere spirit behind it, if a person has a feeling for worship, it does not matter what form of worship it is. In a church, in an open place, everywhere there is an answer to the feeling for worship.