The heart consists of the feelings, will, and intellect; and even includes understanding and wisdom. When these are broken by circumstances we don’t understand, including the delay of a promise, God is not without noticing.
Psalm 51:17 The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise.
2Corinthians 1:20 For all the promises of God in him are yea, and in him Amen, unto the glory of God by us.
Proverbs 13:12 Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life.