Jesus says to the congregation in Philadelphia:
Revelation 3:8 …And I know that you have a little power, and you kept my word and did not prove false to my name.
10 Because you kept the word about my endurance, I will also keep you from the hour of test, which is to come upon the entire inhabited earth, to put to the test those dwelling on the earth.
The congregation in Philadelphia had apparently suffered a lot, but not given up. And Jesus remarked that they had worn out much of their power.
Jesus says to the congregation in Laodicea:
Revelation 3:16 So because you are lukewarm and neither hot nor cold, I am going to vomit you out of my mouth. 17 Because you say, “I am rich and have acquired riches and do not need anything at all,” but you do not know that you are miserable and pitiful and poor and blind and naked.
Apparently the Laodiceans felt themselves relaxed and secure, as do many prosperous people. And they were apparently spiritually lazy.