The Ephesus Church had much going for it.
2:1 Unto the angel of the church of Ephesus write; These things saith he that holdeth the seven stars in his right hand, who walketh in the midst of the seven golden candlesticks;
2:2 I know thy works, and thy labour, and thy patience, and how thou canst not bear them which are evil: and thou hast tried them which say they are apostles, and are not, and hast found them liars:
2:3 And hast borne, and hast patience, and for my name's sake hast laboured, and hast not fainted.
Rev. 1:1-3
It was no doubt a quality New Testament Church.
And
YET Jesus said:
2:4 Nevertheless I have somewhat against thee, because
thou hast left thy first love.
Rev. 2:4
Their love was not as hot as it had been before. Jesus doesnt like lukewarmness in his people.
2:5 Remember therefore from whence thou art fallen, and repent, and do the first works; or else I will come unto thee quickly, and will remove thy candlestick out of his place, except thou repent.
Rev. 2:5