The human mind is capable of acquiring truth at a limited rate. Jesus had spent more than three years with the disciples, during which time He had faithfully instructed them in divine things. They had learned much, but there were many things yet to be revealed (see on ch. 14:26). The wisdom of God is infinite and cannot be exhausted. A lifetime of diligent study enables one to gain but a limited concept of the infinite treasures of spiritual knowledge.

 Sometimes a spiritual lethargy prevents the acquisition of further divine truth. This was the case with the Corinthians, whom Paul designated as “carnal,” who needed to be fed with “milk” rather than with solid food, because they were unable to endure a substantial spiritual diet (1 Cor. 3:1, 2). Christians are urged to leave the first “principles of the doctrine of Christ” and to “go on unto perfection” (Heb. 6:1; cf. Heb. 5:11-14).