For the most part, which of God’s attributes are communicable is self-explanatory. He is loving and we love. Yes, he loves with infinite, independent love and we love with finite, dependent love, but God loves, and in some small way, we image his love. God is holy, too, and he commands us to be holy. He is infinitely and independently holy and we can only be holy as we depend on him to make us holy, but still, when he makes us holy, we truly reflect his holiness. God’s love and his holiness, then, and all the related attributes like righteousness, grace, mercy, etc., are communicable attributes.
It’s with God’s omniscience and omnipotence that classifying the attributes can get a little tricky. It may seem that omniscience should be an incommunicable attribute—after all, it starts with the omni prefix, and we certainly can’t be omni anything. But don’t be fooled by the omni in omniscience. Omni just means unlimited, and all God’s attributes, even the communicable ones, are unlimited. God’s omniscience is simply his unlimited knowledge. And it is a communicable attribute because God has also given us the ability to know. God has knowledge and so do we.