In the practice of spirituality, there is always an interesting tension between form and spontaneity. Too much form can easily become empty hypocrisy whereas too much spontaneity can easily become self-indulgence and dilettantism. The sage Kuya once said "Accumulating merit and practising good one's desires and ambitions increase - nothing is comparable to solitude."
Related to this is the tension between the expression of practice in the world and the inner secret practice in one's heart. On the one hand, if practice does not result in a more virtuous life and an increase in concern for one's fallow beings, it is questionable how genuine it is. On the other hand, spirituality cannot be merely nor primarily such performance. First and foremost it is something secret that goes on in the heart.
In this regard, those forms of spirituality that involve a sense of relationship - with Buddha, with the god(s), with a guardian spirit, however - have a certain advantage. In the privacy of one's room one can talk to the divine one, confess one's doubts, give voice to one's adoration, and reflect upon what one has received and done in return. Even without such a relationship, one can contemplate life and death.
These matters are private, but they are the root from which other more visible aspects spring forth, just as the root of a plant cannot be seen. A plant with a deep root is more stable and enduring. Contriving what look like flowers and fruit when there is no root beneath will achieve nothing real, yet when there is a healthy root, much else will occur naturally.