It is one thing to know, but another indeed, to do. The Rabbis say that “‘he that learns but not to do’, it would have been better for him, if he had never been created;” and says R. Jochanan, “he that learns but not to do, it would have been better for him if his secundine (afterbirth) had been turned upon his face, and he had never come into the world.”  (Hieros. Beracot, fol. 3. 2., qt’d in Gill) That is rather graphic, but it certainly makes its point.

What do you think Jesus is referring to when He says “these things”?

Why does doing these things bring a blessing? Jesus does not tell us here, but He gives a reason for each of the blessings in (Matt 5:3-12). Notice that the person whose character could be painted by the beatitudes would also be the person who would “do these things,” so the reasons are undoubtedly also applicable.

Matthew 5:3-12  “Blessed are the poor in spirit, for theirs is the kingdom of heaven.  Blessed are those who mourn, for they will be comforted.  Blessed are the meek, for they will inherit the earth.  Blessed are those who hunger and thirst for righteousness, for they will be filled.  Blessed are the merciful, for they will be shown mercy.  Blessed are the pure in heart, for they will see God.  Blessed are the peacemakers, for they will be called sons of God.  Blessed are those who are persecuted because of righteousness, for theirs is the kingdom of heaven.  “Blessed are you when people insult you, persecute you and falsely say all kinds of evil against you because of me.
Rejoice and be glad, because great is your reward in heaven, for in the same way they persecuted the prophets who were before you.

Note also the following passages:

Psalms 19:11  By them is your servant warned; in keeping them there is great reward.

Matthew 7:24-25  “Therefore everyone who hears these words of mine and puts them into practice is like a wise man who built his house on the rock.  The rain came down, the streams rose, and the winds blew and beat against that house; yet it did not fall, because it had its foundation on the rock.

Matthew 25:14-30  “Again, it will be like a man going on a journey, who called his servants and entrusted his property to them.  To one he gave five talents of money, to another two talents, and to another one talent, each according to his ability. Then he went on his journey.  The man who had received the five talents went at once and put his money to work and gained five more.  So also, the one with the two talents gained two more.  But the man who had received the one talent went off, dug a hole in the ground and hid his master’s money.  “After a long time the master of those servants returned and settled accounts with them.  The man who had received the five talents brought the other five. ‘Master,’ he said, ‘you entrusted me with five talents. See, I have gained five more.’  “His master replied, ‘Well done, good and faithful servant! You have been faithful with a few things; I will put you in charge of many things. Come and share your master’s happiness!’  “The man with the two talents also came. ‘Master,’ he said, ‘you entrusted me with two talents; see, I have gained two more.’  “His master replied, ‘Well done, good and faithful servant! You have been faithful with a few things; I will put you in charge of many things. Come and share your master’s happiness!’  “Then the man who had received the one talent came. ‘Master,’ he said, ‘I knew that you are a hard man, harvesting where you have not sown and gathering where you have not scattered seed.  So I was afraid and went out and hid your talent in the ground. See, here is what belongs to you.’  “His master replied, ‘You wicked, lazy servant! So you knew that I harvest where I have not sown and gather where I have not scattered seed?  Well then, you should have put my money on deposit with the bankers, so that when I returned I would have received it back with interest.  “‘Take the talent from him and give it to the one who has the ten talents.  For everyone who has will be given more, and he will have an abundance. Whoever does not have, even what he has will be taken from him.  And throw that worthless servant outside, into the darkness, where there will be weeping and gnashing of teeth.’

James 1:25  But the man who looks intently into the perfect law that gives freedom, and continues to do this, not forgetting what he has heard, but doing it—he will be blessed in what he does.

James 4:17  Anyone, then, who knows the good he ought to do and doesn’t do it, sins.

Are you doing as much as you know to do?