Commentaries:
Barnes' Notes
The kingdom of heaven - The meaning here is the same as in the last parable; perhaps, however, intending to denote more properly the secret and hidden nature of piety in the soul. The other parable declared the "fact" that the gospel would greatly spread, and that piety in the heart would greatly increase. This states the "way" or "mode" in which it would be done. It is secret, silent, steady; pervading all the faculties of the soul and all the kingdoms of the world, as leaven, or yeast, though hidden in the flour, and though deposited only in one place, works silently until all the mass is brought under its influence.
Three measures - These were small measures (see the margin); but the particular amount is of no consequence to the story; nor is anything to be inferred from the fact that three are mentioned. That number is mentioned as a circumstance giving interest to the parable, but designed to convey no spiritual instruction. The measure mentioned here probably contained about a peck and a half.
Other Barnes' Notes entries containing Matthew 13:33:
Daniel 2:45
Matthew 16:5-12
Mark 4:29
1 Corinthians 5:6
Hebrews 9:9
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