I think it is, past a certain point, better to put one’s effort more in loving God than to strive to believe and understand, i.e. have faith in, God. You see, the thing about knowing anything is that we “pull to our level” anything that we understand. We elevate our minds everytime we understand something new, but if we encounter anything that is past our current level of knowing, then we try to conceptualize it in terms that we know or invent. Yet God simply cannot be brought to our level totally, even though He has given help to us in doing this by sending His Son to us. But loving has no boundaries, no limit.
Let me give an analogy. A dog has, compared to our own, a very poor understanding of who and what its master is. And yet this limitation of understanding has no impact on the dog’s efforts to love and serve its master. And so it is with us and God: We could never understand fully and believe in the nature of God, no matter how much grace He pours into us. But this can never diminish how much we can love Him: it is actually limitless.
EDIT: And oh yes, I forgot something. Once you learn how to love God, then everything else follows, including hope and faith: Love “bears all things, believes all things, hopes all things, endures all things” (1 Cor 13:7)