The average believer would never consider the word joy to be an appropriate descriptive term for temptations. There is a great explanation for this as the average believer experiences little to no victory when tempted. Temptations put a man’s faith on trial. When his faith stands the test, he learns patience. Therefore, he sees temptation as a means by which he can grow in the Lord and add virtues such as patience. It is not that he finds joy in the temptation itself, but that God can and will use that temptation to make him "perfect and entire, wanting nothing" (James 1:4). Believers who fight through and obtain victory find joy in knowing that their faith pleases God (Hebrews 11:6).
Unity only comes from and through the Lord Jesus Christ, but once it comes, the saints of God must endeavour to keep that unity. One of the reasons why people find unity so elusive is because it requires sacrifice from all those who would enjoy its benefits. Only saints who exercise “lowliness and meekness, with longsuffering” will experience unity. No two believers who are using the minds that God gave them will believe every minute detail alike, yet they can enjoy sweet unity and fellowship in the Lord. Obviously, there are times and reasons for believers to divide, but there are also times for believers to forbear “one another in love” and endeavour to keep the unity. This unity works by love and can only be bonded through peace.