Today's emunah is tomorrow's hightened intellect.

From a Shiur by Rabbi Lazer Brody - Everything is Good

Today's emunah is tomorrow's hightened intellect.

If we accept everything and know that Hashem only gives us what is good for us, then soon we will be able to see that we can know intellectually that everything is for the best.

Rabbi Brody gives the example of Rabbi Akiva and the donkey, candle, and rooster. When Hashem took them away he had emunah that it was for the best, but when he saw the next day that this saved his life, he KNEW that it was for the best.