And Isaac went out to meditate in the field

And Isaac went out to meditate in the field (Gen. 24:63)

Rashi explains that the word "meditate" means "to pray--as if pouring forth the contents of one's heart." If such is the case, why didn't the Torah explicitly state that Isaac went out to pray in the field?

We are supposed to take a lesson for our general conduct from the way Isaac prayed. A person should not call attention to himself and publicly announce his fear of Heaven. Rather, we should conduct ourselves as Isaac did--quietly, and without fanfare. A passer-by would have thought that Isaac was only strolling in the field, when in reality he was composing the afternoon prayer.

(Leket Amarim)