Sab jag Ishwar roop hai,
bhalo buro nahi koyi
Jaki jaisi bhavana,
taiso hi phal hoyi
This couplet in Hindi means that the whole creation is nothing but the manifestation (modified form) of God himself, hence, nothing in this creation is bad and nothing is good. This couplet further explains that whatever we feel for anybody or for anything in this world, so will be the reaction and result from it in our life.
There are two aspects/secrets explained in the above couplet. One is the highest spiritual knowledge about the creation and the second about the behavioural aspect of creation.
The first secret about the creation explains that God (God is referred here as the divine energy which is formless, omnipresent, omnipotent and eternal) has itself modified into various forms in the process of creation. Having taken various forms, it has got various attributes based on each form.
Whenever a substance or a thing changes its form, it also changes its qualities and attributes. It appears completely different than its original substance. For example, when the ocean water evaporates, it converts itself into water vapour and is invisible to our eyes. Though we could see it as water, we cannot see it as water vapour.
Not only that, we could drink it, take bath with it, but now, after it has converted into water vapour, we cannot drink it nor we can bathe with it. Thus, the whole creation is nothing but the modified form of the supreme divine being and that divine being alone has become many objects. Everything in the creation is he. There is nothing other than him. When everything is he, there cannot be anything as good or bad. This is the ultimate truth in spirituality.
