Tinyana 70 · תנינא ע׳

The greater the person, the farther he must go in search of what he seeks.

We see, for example, that plant life has what it seeks right next to it, because it grows from the ground which is literally adjacent. What an animal seeks is also on the ground, but a bit farther away than that of plant life. This is because an animal is on a higher level than plant life. A human being, however, has to go much, much farther than an animal in search of what he seeks.

Thus, Moshe Rabbeinu, of blessed memory, who was on a very lofty level, had to go exceedingly far in search of what he sought. This is why he had to seek a wife in Midian. On account of his greatness, that which he sought was far away.