ONLY IN CHRIST'S WORD AND SPIRIT, IS THERE DISCERNMENT AND UNDERSTANDING

 I believe the Lord has given me the gift of discernment for His word, and the times we are living in. (But, when it comes to discerning people? Not so much. The Lord has given that gift to my wife. We make as perfect a team as it can get.)
This doesn't mean I can "know all and tell all". The gifts of the Holy Spirit are not carnival acts, although this is debatable with the demonstrations and side shows of many of our brothers, sisters and denominations:

Matthew 24:4-5  And Jesus answered and said unto them, Beware and take strides that no man deceive you.  (5)  For many shall come in my name, saying, I am Christ; and shall deceive many
Matthew 24:11-12   And many false prophets shall rise, and shall deceive many.  (12)  And because iniquity shall abound, the love of many shall wax cold. 
Matthew 24:23-26  Then if any man shall say unto you, Look, here is Christ, or there; believe it not.  (24)  For there shall arise false Christs, and false prophets, and shall show great signs and wonders; to the degree that, if it were possible, they shall deceive the very elect.  (25)  Behold, I have told you before.  (26)  Therefore if they shall say unto you, Behold, he is in the desert; go not forth: behold, he is in the secret chambers; believe it not.

Revelation 13:11-14  And I beheld another beast coming up out of the earth; and he had two horns like a lamb, and he speaks as a dragon.  (12)  And he exercises all the power of the first beast before him, and causes the earth and them which dwell there to worship the first beast, whose deadly wound was healed.  (13)  And he does great wonders, so that he makes fire come down from heaven on the earth in the sight of men,  (14)  And deceives them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live.

The two horns of the second beast are two fold in meaning: He will masquerade as the prophet of Christ at the very least, or as Christ Himself, the two horns symbolic of the "Lamb Of God". He will also give the appearance of being demure and humble.
We see throughout the period of time spoken of by the Lord, there are false Christs, teachers, preachers and prophets right up until the time of the Lord's return! 
The need for Spiritual discernment will never be needed more than in the last days.These days.

And what I say unto you I say unto all, Watch.Mark 13:37 
Nowhere in time have the Lord's warning ever been more relevant and obvious as now, and it promises to get worse: 

Matthew 24:8-10  All these are the beginning of sorrows.  (9)  Then shall they deliver you up to be afflicted, and shall kill you: and ye shall be hated of all nations for my name's sake.  (10)  And then shall many be offended, and shall betray one another, and shall hate one another.

Mark 13:12  Now the brother shall betray the brother to death, and the father the son; and children shall rise up against their parents, and shall cause them to be put to death.
Matthew 24:21-22  For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be. (22)  And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened. 

Revelation 13:6-8  And he [the first beast]opened his mouth in blasphemy against God, to blaspheme his name, and his tabernacle, and them that dwell in heaven.  (7)  And it was given unto him to make war with the saints, and to overcome them: and power was given him over every race, language, and nations.  (8)  And [he will cause] all that dwell upon the earth will worship him, whose names are not written in the book of life of the Lamb slain from the foundation of the world.
Revelation 13:15-18  And he [the second beast] had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed.  (16)  And he causes all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:  (17)  And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.  (18)  Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.

MATTHEW 24:13 BUT THEY THAT ENDURE UNTIL THE END, THE SAME SHALL BE SAVED

Side Note and Simply an Observation:

I don't recall ever seeing a spiritual leader on the world stage, that goes to GREAT lengths to ensure the whole world sees how "humble" (two horns like a lamb) he is, than Pope Francis. He is well liked and/or loved from the secular to the Christian. He is honored and respected by Jews and Muslims (outwardly at the very least). Although "humble". he is known to take strong stands and he is very strong vocally (speaks as a dragon) on world issues from economics, politics and spiritual. He is the venerated (It really means "worshiped" although Catholics disagree with the term, but obviously not the action)) leader of roughly four billion Catholics worldwide, (1/3 of the world population) which doesn't include non Catholics (such as the ones I mentioned previously) who would follow him almost blindly. This is just MY observation.


LASTLY

THE MARK OF A TRUE PROPHET AND PREACHER OF GOD (especially in the last days), IS IN ALL THAT IS DISCERNED, TAUGHT, PREACHED AND IN THEIR LIFESTYLE, ALWAYS  GLORIFIES THE BIBLICAL CHRIST AND GOD, CONFIRMS THE BIBLE AND IS ALWAYS CONFIRMED BY THE BIBLE AND THE HOLY SPIRIT.
WE ALWAYS NEED TO STRIVE TO STAY IN TUNE WITH CHRIST, HIS WORD AND HIS SPIRIT, ALWAYS REMEMBERING THAT IT IS HIS WORD AND SPIRIT THAT BRINGS SALVATION, STRENGTH, UNDERSTANDING AND DISCERNMENT, NEVER EMPHASIZING THE WORKS OF MAN ABOVE THOSE OF GOD.
 Luke 13:24   Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able.