Paul lists the "works of the flesh" and contrasts the "fruit of the spirit" in Galatians chapter five.  "Now the works of the flesh are made manifest, which are these: adultery, fornication, uncleaness, lasciviousness, idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, envyings, murders, drunkeness, revellings, and such like...But the fruit of the spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, meekness, temperance..."(5:19-21a, 22)

In verse 22, the word "fruit" is singular even though it encompasses multiple virtues.  The singularity of this word is designed to convey a complete, well-rounded picture of the character of a child of God.  It imparts the idea that the 'fruit" is a single unit which consists of individual parts.  Each of these parts plays a significant, unique role in creating "fruit' as a whole.  They strive in balance and harmony with each other to achieve the one product.  Without every one of these parts the fruit is incomplete.

In contrast to this, note that in verse 19 Paul uses the word "works" (plural) rather than the word "work" (singular).  Why would he use the plural word form here?  Unlike the single "fruit," the many "works" are disjunctive.  True, they do stem from one source,  but they do not connect together in balance and harmony to produce a single unit.

They produce confusion and visions, even among themselves.  The "works" are unproductive and, in the end there will be no harvest - it matters not how much activity there has been.  The only anticipated outcome from the "works of the flesh" are death and destruction.

Like other passages, there is preciseness in this Holy Spirit inspired context.  As Paul used the singular word "seed" to make an argument in Galatians 3:16, he also used the singular word "fruit" here to make an important point.  The subtelties of this exactness give us a greater appreciation of the wisdom and perfection of scripture.

To enhance your appreciation of the beauty and depth of the word, study it with the same precision as was needed to write it.  Strive to be a complete, well-rounded child of God.  Refrain from the unfruitful works of the flesh (Ephesians 6:11).  Perfect the virtues Paul lists in Galatians 5:22 so you will become that single, complete fruit. - Andrew Lehmann