...If indeed you have tasted that the Lord is good.1 Peter 2:3
"If." Then this is not a matter to be taken for granted concerning every one of the human race. "If"--then there is a possibility and a probability that some may not have tasted that the Lord is gracious. "If"--then this is not a general but a special mercy; and it is necessary to ask whether we know the grace of God by inward experience. There is no spiritual favor that may not be a matter for heart-searching.
But while this should be a matter of earnest and prayerful inquiry, no one ought to be content while there is any such thing as an "if" about his having tasted that the Lord is good. A jealous and holy distrust of self may give rise to the question even in the believer's heart, but the continuance of such a doubt would be an evil indeed. We must not rest without a desperate struggle to clasp the Savior in the arms of faith and say, "I know whom I have believed, and I am convinced that he is able to guard until that Day what has been entrusted to me."1
Do not rest, believer, until you have a full assurance of your interest in Jesus. Let nothing satisfy you until, by the infallible witness of the Holy Spirit bearing witness with your spirit, you are identified as a child of God. Do not trifle with this. Do not be satisfied with "perhaps" or "if" or "maybe." Build on eternal truths; really build upon them. Let your anchor be cast into that which is within the veil, and see to it that your soul is linked to the anchor by a cable that will not break. Get beyond these dreary "ifs"; stay no longer in the wilderness of doubts and fears; cross the Jordan of distrust, and enter the promised land of peace, where the land ceases not to flow with milk and honey.
1) 2 Timothy 1:12