Psalm 1:1,2 - Progression of Sin: Walking, Standing, Sitting with Sinners.

Psa.1:1,2; Progression of Sin: Walking, Standing, Sitting with
Sinners.

Blessed is the man that walketh not in the counsel of the
ungodly, nor standeth in the way of sinners, nor sitteth in the seat of
the scornful.  But his delight is in the law of the LORD; and in his
law doth he meditate day and night. Psa 1:1,2 (KJV)

The verbs "walk," "stand," and "sit" (1:1) describe the
successive steps of a person's involvement with evil. [New Bible
Companion]

Walketh, standeth, sitteth, describe the characteristic steps of
the wicked which the righteous avoid: accepting the principles of
the wicked, participating in the practices of outright sinners, and
finally joining with those who openly mock. Wycliffe Bible Commentary

"Walk" refers to infrequent ungodliness. "Stand" describes the
habitual practice of sin. The image "sit in the seat" is of those who
instruct others in a community's way of life, so that sitting with
scoffers is hardened commitment to sin's ways. [Victor Bible Reader's
Companion]

Walketh, ... standeth, ... sitteth. The three words portray in
climactic order the successive steps in a life of evil: (1) going in the
general direction of those who are alien to God, conforming to worldly
customs; (2) stopping to associate with rebels under the spell of sin,
dallying with temptation; (3) definitely joining the group of sinners,
settling down in disregard of light. [SDA Commentary]

Note the progression of evil from mere association to
identification to fixation. [Believer's SB]

The great lesson to be learned from the whole is, sin is
progressive; one evil propensity or act leads to another. He who acts by bad
counsel may soon do evil deeds; and he who abandons himself to evil
doings may end his life in total apostasy from God. "When lust has
conceived, it brings forth sin; and when sin is finished, it brings forth
death." (Adam Clarke Commentary)

His Delight; his will, desire, affection, every motive in his
heart, and every moving principle in his soul, are on the side of God
and his truth. He takes up the law of the Lord as the rule of his
life; he brings all his actions and affections to this holy standard.
He looketh into the perfect law of liberty, and is not a forgetful
hearer, but a doer of the word; and is therefore blessed in his deed. He
not only reads to gain knowledge from the divine oracles, but he
meditates on what he has read, feeds on it; and thus receiving the sincere
milk of the word, he grows thereby unto eternal life. This is not an
occasional study to him; it is his work day and night. Since his heart is
in it, the employment must be frequent, and the disposition to it
perpetual. (Adam Clarke Commentary)

To meditate in God's word, is to discourse with ourselves
concerning the great things contained in it, with close application of mind
and fixedness of thought. We must have constant regard to the word
of God, as the rule of our actions, and the spring of our comforts;
and have it in our thoughts night and day. For this purpose no time
is amiss. [Matthew Henry Commentary]

Day and night-i.e., continually rehearsing God's standards in
all situations of life. [Jamieson, Fausset, And Brown Commentary]

Those whom God blesses are not delighted with what pertains to
sin and the world; they delight in the Word of God. It is love for
and obedience to the Bible that brings blessing on our lives. See
Josh. 1:8. The people God blesses not only read the Word daily, but
they study it, memorize it, and meditate on it during the day and
night. Their mind is controlled by the Word of God. Because of this,
they are led by the Spirit and walk in the Spirit. Meditation is to
the soul what "digestion" is to the body. It means understanding the
Word, "chewing on it," and applying it to our lives, making it a part
of the inner person. [Wiersbe's Expository Outlines]