J.C. Ryle wrote:
Leave no stone unturned in order to ascertain your own spiritual state. Be not content with vague hopes and trusts. Rest not on warm feelings and temporary desires after God. Give diligence to make your calling and election sure. Oh, allow me to say that if you are content to live on, uncertain about salvation, you live the maddest life in the world! The fires of hell are before you—and you are uncertain whether your soul is saved. This world below must soon be left—and you are uncertain whether you have a mansion prepared to receive you in the world above. The judgment will soon be set—and you are uncertain whether you have an Advocate to plead your cause. Eternity will soon begin—and you are uncertain whether you are prepared to meet God. Oh, sit down this day, and study the subject of salvation! Give God no rest until uncertainty has disappeared, and you have got hold of a reasonable hope that you are saved.
I'm thinking Hebrews 10.19-25 ...