The guarantee will be inner. It will be a commitment from the heart, it will be a silent communion. If you enjoy being with somebody, you would like to enjoy it more and more. If you enjoy the intimacy, you would like to explore the intimacy more and more.
And there are a few flowers of love which bloom only after long intimacies. There are seasonal flowers too: within six weeks they are there in the sun, but within six weeks again they are gone forever. There are flowers which take years to come. The longer it takes, the deeper it goes.
But it has to be a commitment from one heart to another heart. It has not even to be verbalized, because to verbalize it is to profane it. It has to be a silent commitment: eye to eye, heart to heart, being to being. It has to be understood, not said.
It is so ugly seeing people going to the church or the court to get married. It is so ugly, so inhuman. It simply shows they can't trust themselves, they trust the policeman more that they trust their own inner voice. It shows they can't trust their love, they trust the law.
