The Bible is not embarrassed about the fact that not all things have been revealed to us. For the moment we see but a poor reflection (1 Cor. 13:12, see also Deut. 29:29). Sometimes we have to say 'only God knows' but that is not the same as declaring 'it makes no sense'. As Os Guinness writes:
... rationality is the alternative of absurdity, but has no quarrel with mystery. Mystery is beyond human reason, but is not against reason. It is a mystery only to man and not to God. Where God has spoken and spoken clearly, rationality comes into its own; where God has not spoken, or for his own reasons not spoken clearly, there is the area of mystery. An area of mystery is rational to God, but faith must suspend judgement and not press human reason to answer questions when it has insufficient evidence.