2 Kings 10:30
And the LORD said unto Jehu, Because thou hast done well in executing that which is right in mine eyes, and hast done unto the house of Ahab according to all that was in mine heart, thy children of the fourth generation shall sit on the throne of Israel.
Jehu's zeal in executing what was right in God's eyes did not keep him from becoming self-exalting and speaking harshly. A person in a position of influence who begins years of service with Jehu's spirit will reap what he has sown. Staying close to God and speaking with gentleness and love are needed to avoid following Jehu's example.