The sidra of Ki Tetzei contains, according to Maimonides, 72 of the fabled 613 commandments in the Torah – on first reading the effect is of an enormous list of apparently haphazard rules ranging from family relationships to the treatment of a judicially executed corpse. From care for animals to cultic prostitution; from financial probity to cloth made from a mixture of wool and linen.

Throughout history Jewish scholars have tried to explain the unified theory of mitzvot; rather like with the laws of physics there is the sense that somehow there is an elegant rationale that, once found, will enlighten us about the world and its meaning. The best try (in my view) is that of Rabbi Pinchas b Hama who wrote (Devarim Rabbah 6:3) that “Wherever you go and whatever you do, pious deeds will accompany you. When you build a new house, make a parapet for the roof. When you make a door write the commandments on the doorposts; when you put on new garments consider from what they are made; when you reap your harvest and forget a sheaf, leave it for the widow, orphaned and the stranger, the vulnerable in your society”

In other words, every aspect of our daily life can be made holy through following these mitzvot – the mundane can be raised to the exceptional, the quality of our lives infinitely changed in these tiny regular incremental actions.

Many years ago studying with Rabbi Hugo Gryn zl I learned about the Shema, the prayer recited morning and evening of each day, for many people the defining prayer of Judaism. It speaks in the first line of the unity of God, and of the relationship of God and Jews. But before it does it demands something else of us – Shema – listen! Pay attention! Hear what is really important!

The first command in the prayer is to love God completely – with heart, spirit and physical strength. Then we are told that God’s commandments should be with us always, spoken of repeatedly to our children, talked about when we sit in our home, when we are walking outside, when we lie down, when we get up. They are to be written upon our doorposts so that going in and out of our homes we see and are reminded of the requirements of God. And in the Shema too we are told “ukshartam l’ot al yadecha, v’hayu l’totafot beyn eynecha” you shall hold fast to them as a sign upon your hands and they will be (reminders) before your eyes. The line has been understood to be the source of the practise of placing tefillin – small leather boxes containing some prayers – on the head and hand during the weekday morning prayer as an aid to remembering, but Rabbi Gryn had a different view – he understood it to say “in everything your hand touches and everything your eye sees you must respond to the requirements of God.”

If we really fulfil the commandment of ‘Shema’, then no part of our life is exempt from the dictates of holiness. We cannot be pious in the synagogue but not at home or at work. We cannot care about the humanity of the people we like but not that of those we dislike or disagree with. We cannot do the technical bare minimum to fulfil our obligations to society and consider our job well done. As another part of this sidra says – lo tuchal le’hitalem– You are not able to/ must not remain indifferent.

In this sidra too is the commandment to wear tzitzit – the knotted threads on the edges of some garments, most usually seen today on the tallit, which are the physical reminders that we have regular and routine obligations as Jews. Our obligation to love God is played out in our world – how we relate to others, how we care for the vulnerable, how we manage risk, how we nurture good values. The traditional unified theory of mitzvot is based on an unquestioned acceptance of the Metzaveh – the One who commands – that is God. In today’s world that understanding does not work so well – there are many who find such faith impossible or even undesirable. And yet the value of the system of mitzvot remains powerful – Judaism has never asked what you believe, but demands that you behave according to its belief. Lack of faith in God is no excuse for lack of proper behaviour towards others.