While Alma taught them, a small group had also gathered there to listen. They were the poor in substance and spirit and sought truth, but had been turned out of these places of worship because of their poverty. Alma, seeing that these individuals were humble and, unlike their counterparts, were prepared and eager to receive more truth and wisdom, turned his focus completely to them and taught them to experiment upon the word as if it were a seed, inviting them to test what they have heard and to righteously judge whether it was of God or of man.
Anyone can use this same test to determine whether the Book of Mormon is truly scripture revealed of God.
In Alma 32, we read (my emphasis and [notes] added):
26 Now, as I said concerning faith—that it was not a perfect knowledge — even so it is with my words. Ye cannot know of their surety at first, unto perfection, any more than faith is a perfect knowledge.So, as you can see, knowing the truth of something is not simply hearing it, finding it agreeable, and moving on. If you do only that, you will have neglected to grow that truth by nourishing it as you would a tree seedling. To make it grow within you, you have the responsibility--the imperative--to be humble, and to keep wanting more and learning more to get perfect knowledge of God's truth.
27 But behold, if ye will awake and arouse your faculties, even to an experiment upon my words, and exercise a particle of faith, yea, even if ye can no more than
desire to believe, let this desire work in you, even until ye believe in a manner that ye can give place for a portion of my words.
28 Now, we will compare the word unto a seed. Now, if ye give place, that a seed may be planted in your heart, behold, if it be a true seed, or a good seed, if ye do
not cast it out by your unbelief, that ye will resist the Spirit of the Lord, behold, it will begin to swell within your breasts [archaic "chest"] ; and when you feel these swelling motions, ye will begin to say within yourselves—It must needs be that this is a good seed, or that the word is good, for it beginneth to enlarge my soul; yea, it beginneth to enlighten my understanding, yea, it beginneth to be delicious to me.
29 Now behold, would not this increase your faith? I say unto you, Yea; nevertheless it hath not grown up to a perfect knowledge.
30 But behold, as the seed swelleth, and sprouteth, and beginneth to grow, then you must needs say that the seed is good; for behold it swelleth, and sprouteth, and beginneth to grow. And now, behold, will not this strengthen your faith? Yea, it will strengthen your faith: for ye will say I know that this is a good seed; for behold it sprouteth and beginneth to grow.
31 And now, behold, are ye sure that this is a good seed? I say unto you, Yea; for every seed bringeth forth unto its own likeness.
32 Therefore, if a seed groweth it is good, but if it groweth not, behold it is not good, therefore it is cast away.
33 And now, behold, because ye have tried the experiment, and planted the seed, and it swelleth and sprouteth, and beginneth to grow, ye must needs know that the seed is good.
34 And now, behold, is your knowledge perfect? Yea, your knowledge is perfect in that thing, and your faith is dormant; and this because you know, for ye know that the word hath swelled your souls, and ye also know that it hath sprouted up, that your understanding doth begin to be enlightened, and your mind doth begin to expand.
35 O then, is not this real? I say unto you, Yea, because it is light; and whatsoever is light, is good, because it is discernible, therefore ye must know that it is good; and now behold, after ye have tasted this light is your knowledge perfect?
36 Behold I say unto you, Nay; neither must ye lay aside your faith, for ye have only exercised your faith to plant the seed that ye might try the experiment to know if the seed was good.
37 And behold, as the tree beginneth to grow, ye will say: Let us nourish it with great care, that it may get root, that it may grow up, and bring forth fruit unto us. And now behold, if ye nourish it with much care it will get root, and grow up, and bring forth fruit.
38 But if ye neglect the tree, and take no thought for its nourishment, behold it will not get any root; and when the heat of the sun cometh and scorcheth it, because it hath no root it withers away, and ye pluck it up and cast it out.
39 Now, this is not because the seed was not good, neither is it because the fruit thereof would not be desirable; but it is because your ground is barren, and ye will not nourish the tree, therefore ye cannot have the fruit thereof.
40 And thus, if ye will not nourish the word, looking forward with an eye of faith to the fruit thereof, ye can never pluck of the fruit of the tree of life.
41 But if ye will nourish the word, yea, nourish the tree as it beginneth to grow, by your faith with great diligence, and with patience, looking forward to the fruit
thereof, it shall take root; and behold it shall be a tree springing up unto everlasting life.
42 And because of your diligence and your faith and your patience with the word in nourishing it, that it may take root in you, behold, by and by ye shall pluck the fruit thereof, which is most precious, which is sweet above all that is sweet, and which is white above all that is white, yea, and pure above all that is pure; and ye shall feast upon this fruit even until ye are filled, that ye hunger not, neither shall ye thirst.
43 Then, my brethren, ye shall reap the rewards of your faith, and your diligence, and patience, and long-suffering, waiting for the tree to bring forth fruit unto you.
Similarly, if you neglect to even try the experiment, you can't possibly expect any fruit to come of it. That doesn't at all mean that the seed is bad, just that you didn't try the experiment.
It's one of the simplest laws of the harvest: From that which we sow and tend to and provide favorable conditions for, we can expect to reap something beneficial if the seed is good. If it is not, it simply won't grow no matter how much we nourish it. Conversely, from that which we do not sow, or that which we sow and then neglect, we cannot expect to reap anything at all.