Revelation 3:2-3

Thomson(i) 2 Be watchful, and strengthen the remains which are likely to die. For I have not found thy works perfect in the sight of God. 3 Remember therefore how thou hast received, and heard, and keep fast hold, and reform. For if thou wilt not watch, I will come against thee, as a thief, so that thou shall not know at what hour I shall come against thee.