Ps 1:1
1:1 Blessed [is] the man that walketh not in the {a} counsel of
    the ungodly, nor standeth in the way of sinners, nor sitteth
    in the seat of the scornful.

 The Argument - This book of psalms is given to us by the Holy
    Spirit, to be esteemed as a precious treasure in which all
    things are contained that bring to true happiness in this
    present life as well as in the life to come. For the riches
    of true knowledge and heavenly wisdom, are here set open for
    us, to take of it most abundantly. If we would know the
    great and high majesty of God, here we may see the
    brightness of it shine clearly. If we would seek his
    incomprehensible wisdom, here is the school of the same
    profession. If we would comprehend his inestimable bounty,
    and approach near to it, and fill our hands with that
    treasure, here we may have a most lively and comfortable
    taste of it.  If we would know where our salvation lies and
    how to attain to everlasting life, here is Christ our
    Redeemer, and Mediator most evidently described. The rich
    man may learn the true use of his riches. The poor man may
    find full contentment. He who will rejoice will know true
    joy, and how to keep measure in it. They who are afflicted
    and oppressed will see what their comfort exists in, and how
    they should praise God when he sends them deliverance. The
    wicked and the persecutors of the children of God will see
    how the hand of God is always against them: and though he
    permits them to prosper for a while, yet he bridles them, so
    much so that they cannot touch a hair of ones head unless he
    permits them, and how in the end their destruction is most
    miserable. Briefly here we have most present remedies
    against all temptations and troubles of mind and conscience,
    so that being well practised in this, we may be assured
    against all dangers in this life, live in the true fear and
    love of God, and at length attain the incorruptible crown of
    glory, which is laid up for all who love the coming of our
    Lord Jesus Christ.

    (a) When a man has once given place to evil counsel, or to
        his own sin nature, he begins to forget himself in his
        sin, and so falls into contempt of God, which is called
        the seat of the scorners.

Ps 1:2
1:2 But his delight [is] in the law of the LORD; and in his {b}
    law doth he meditate day and night.

    (b) In the holy scriptures.

Ps 1:3
1:3 And he shall be like a tree planted by the rivers of water,
    that bringeth forth his fruit in his season; his leaf also
    shall not wither; and {c} whatsoever he doeth shall prosper.

    (c) God's children are so moistened with his grace, that
        whatever comes to them, tends to their salvation.

Ps 1:4
1:4 {d} The ungodly [are] not so: but [are] like the chaff which
    the wind driveth away.

    (d) Though the wicked seem to prosper in this world, yet the
        Lord drives them down that they shall not rise nor stand
        in the company of the righteous.

Ps 1:5
1:5 Therefore the ungodly shall not stand in the {e} judgment,
    nor sinners in the congregation of the righteous.

    (e) But tremble when they see God's wrath.

Ps 1:6
1:6 For the LORD {f} knoweth the way of the righteous: but the
    way of the ungodly shall perish.

    (f) Approves and prospers, in the same way that to not know
        is to reprove and reject.