+I. He will hear.+ He shows that he values what he has already attained by giving heed to those who are able to add to his knowledge. Those who know the most are the most open to receive fresh knowledge. +II. The necessary consequence of this willingness to hear is a growth in knowledge.+ The wise man "will increase learning." There is an absolute promise in connection with spiritual wisdom. "Whosoever hath, to him shall be given, and whomsoever hath not, from him shall be taken even that which he seemeth to have" (Luke viii. 18). He who has wisdom to give heed shall have his wisdom increased by giving heed. To those who are willing to hear, that what was once dark and difficult becomes clear and plain. They "understand a proverb and the interpretation; the words of the wise and their dark sayings." This hearing implies more than a mere reception of sound. It includes a desire to translate precepts into deeds. Many who can understand the grammatical construction and literal meaning of the Divine oracles cannot apprehend their spiritual signification because they do not desire to submit to their guidance. This was the condition of many of the Scribes and Pharisees in the days of our Lord. They saw and yet were blind (Matt. xiii. 13; John ix. 39). "If any man will do his will, he shall _know_ of the doctrine," etc. (John vii. 17). +III. This growth in knowledge gives a man a guide for his own life and enables him to guide others.+ (For "wise counsels," see Critical Notes). Such a man will not sound all the mysteries of life or of God, but enough will be made plain to give him a compass by which to steer; and he will be able to lead others. A diligent pupil will by-and-by be fit for a teacher. How fully was the truth of these verses exemplified in the history of the Apostles. What dull pupils they were at first, and even until after their Master's resurrection. (Luke xxiv. 25.) But their willingness to be _disciples_--_learners_--fitted them at length to "go and teach all nations." (Matt. xxviii. 19.) Continuing in Christ's Word, they came to "know the truth," according to His promise. (John viii. 31.) _OUTLINES AND SUGGESTIVE COMMENTS._ Verse 5. True wisdom is never stationary, but always progressive; because it secures the ground behind it as a basis for further advances. "He who is not adding is wasting; he who is not increasing knowledge is losing from it," says Rabbi Hillel.--_Fausset._