However, there is an *unbiblical* way of using the Bible to encourage and exhort. (In fact, there are *many*.)
The heart is more like a scale, specifically, it is more like a "balance scale," the kind often used as a symbol for justice because its two sides weigh different arguments and positions in the process of reaching a true and proper judgment.
A proper use of biblical encouragements and exhortations will take this into account.
As in: "I know your heart is (rightly) heavy with sorrow due to the loss of some good thing(s), that it is overwhelmed by threatening circumstances, that it is uncertain of what tomorrow may bring...