Israel on Mt Sinai used a strange formula.
We shall do, (perform, observe) , and we shall hear
It should have been vice versa!
First you hear and listen, then you do what should be done.
Of course “hear” here means harken, understand.
Our vow at Mt Sinai was to observe the Mitzvot, even without understanding why they should be done. Observance is not conditioned by understanding.
However, we do not neglect or underestimate understanding. On the contrary, it is included in that same vow to strive to understand (“hear”) as much as we can – only not as condition for performing the Mitzvot.
Furthermore, it is our belief, that understanding is sure to come – more and more – as we persevere in observing the Mitzvot:
We shall do, and then we are sure to hear and understand.
Obedience is not conditioned by understanding, because it’s really the other way round:
Understanding is conditioned by obedience.
And the Midrash says that that’s the Secret of the Angels.