Adam Clarke on Revelation 3:18

I counsel thee - O fallen and deceived soul, hear Jesus! Thy case is not hopeless. Buy of me.

Gold tried in the fire - Come and receive from me, without money and without price, faith that shall stand in every trial: so gold tried in the fire is here understood. But it may mean pure and undefiled religion, or that grace or Divine influence which produces it, which is more valuable to the soul than the purest gold to the body. They had before imaginary riches; this alone can make them truly rich.

White raiment - Holiness of heart and life.

Anoint thine eyes - Pray for, that ye may receive, the enlightening influences of my Spirit, that ye may be convinced of your true state, and see where your help lies.