God’s longsuffering is mentioned in conjunction with His grace and mercy again and again, as may be seen by consulting Exodus 34:6, Numbers 14:8, Psalm 86:15, etc. That the patience of God is really a display of His mercy, that it is indeed one way in which it is frequently manifested, cannot be denied. But that patience and mercy are one and the same excellency, and are not to be separated, we cannot concede. It may not be easy to discriminate between them, nevertheless Scripture fully warrants us in affirming some things about the one which we cannot about the other.
– Pink, Arthur W.; The Attributes of God; Kindle Edition; page 60