The Lord spoke to His bondservant Samuel, asking him how long he would grieve for Israel’s first king, now that He had rejected him? God commanded His prophet to anoint a new king from the house of Jesse. As he was considering each of Jesse’s sons in turn, God said to Samuel:
“Do not look on his appearance or on the height of his stature, because I have rejected him. For the Lord sees not as man sees: man looks on the outward appearance, but the Lord looks on the heart.” 1 Samuel 16:7 English Standard Version (ESV)
The true saints have not such a spirit of discerning that they can…determine [with certainty] who are godly, and who are not. For though they know experimentally what true religion is, in the internal exercises of it; yet these are what they can neither feel, nor see, in the heart of another. There is nothing in others, that comes within their view, but outward manifestations and appearances; but the Scripture plainly intimates, that this way of judging what is in men by outward appearances, is at best uncertain, and liable to deceit…
In his commentary, Edwards counsels us to treat all in the visible church charitably:
When there are many probable appearances of piety in others, it is the duty of the saints to receive them cordially into their charity, and to love them and rejoice in them, as their brethren in Christ Jesus. But yet the best of men may be, when the appearances seem to them exceeding fair and bright, as entirely to gain their charity, and conquer their hearts.
Yet, we will see some, who first profess and evidence godliness, fall away from the church:
It has been common thing in the church of God, for such bright professors, that are received as eminent saints, among the saints, to fall away and come to nothing…There may be all these things [i.e., evidences of piety], and yet there be nothing more than the common influences of the Spirit of God, joined with the delusions of Satan, and the wicked and deceitful heart…
He then reminds us of the warning Christ delivered using wheat and tares for His illustration:
In the parable of the wheat and tares, it is said, Matt. 13:26, “When the blade was sprung up, and brought forth fruit, then appeared the tares also.” As though the tares were not discerned, nor distinguishable from the wheat, until then, as Mr. Flavel observes, who mentions it as an observation of Jerome’s, that “wheat and tares are so much alike, until the blade of the wheat comes to bring forth the ear, that it is next to impossible to distinguish them.”
And then Mr. Flavel adds, “How difficult so ever it be to discern the difference between wheat and tares; yet doubtless the eye of sense can much easier discriminate them, than the quickest and piercing eye of man can discern the difference between special and common grace.
For all saving graces in the saints, have their counterfeits in hypocrites; there are similar works in those, which a spiritual and very judicious eye may easily mistake for the saving and genuine effects of a sanctifying spirit.”
Finally, Edwards drives home the message again:
This notion, of certainly discerning another’s state [by surface appearances] is not only not founded on reason or Scripture, but it is anti-scriptural, it is against the rules of Scripture; which say not a word of any such way of judging the state of others as this, but direct us to judge chiefly by the fruits that are seen in them.
Having been a member of several churches, some of which have disbanded, I can say from experience that it belongs to God alone to determine the state of other’s souls:
Therefore, do not pronounce judgment before the time, before the Lord comes, who will bring to light the things now hidden in darkness and will disclose the purposes of the heart. Then each one will receive his commendation from God. 1 Corinthians 4:5 (ESV)
And it is also certain: “you will recognize them by their fruit,” and those fruit of the spirit to look for are: love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control. As the Apostle Peter reminded us:
If these qualities are yours and are increasing, they keep you from being ineffective or unfruitful in the knowledge of our Lord Jesus Christ. 2 Peter 1:8 (ESV)
Wheat and Tares, Nazareth Village, James Emery, 1 May 2007, used under the Creative Commons Attribution 2.0 Generic license