Wise saying

12 Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.
13 Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
14 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
24 Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:
25 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.
26 And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
27 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.
28 And it came to pass, when Jesus had ended these sayings, the people were astonished at his doctrine:
29 For he taught them as one having authority, and not as the scribes.

Word for today:....but it did not fall, because it had been founded on the rock v. 25

source

Jesus is the narrow gate that leads to life, even though many claims to be an alternative, there is no other way. This is what makes Christianity unique, it is not either or, it is Jesus only. It is important in a world that believe that there are many other ways, to emphasize that Christ is the only way.
This leads directly to the message of vv14-20 which is a warning against false teachings and teachers.these usually emphasize false piety and disguise as sheep, but are actually dangerous as wolves. Sometimes you cannot easily discern them from their message, but ultimately we can know them by their 'fruits', the outcome of their live and message. Sadly, sometimes they would have ruined many live before they are discovered for what they are.

Again, we need to be careful, if we really his disciples we have to show it by our lives(vv.21-24).in a time when many are chasing after miracles and the demonstration of power, and it has become popular to identify with Jesus and give him only verbal allegiance, let us be warned. Miracles do not always mean God's approval.
Lastly, the only real evidence of true discipleship is obedience to the words of Jesus and this is true wisdom.this is life that will endure, so Jesus taught, with divine authority, who can add to it?

Prayer: lord help me to be wise and obey your words.