Ye must know that it is good

1. Alma 32: 33, 35
     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.
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     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?