For some information on the Buddhist monk and teacher Han Shan Te Ching (1546–1623 CE) see this post.
There are times when we act with unshakable faith in the Dharma even though we don’t understand the situation we’re in. There are other times when we understand our situation but are afraid to be completely faithful.
In one instance, we have heart; and in the other we have mind. We must put these two together! Understanding AND faith!