Source: Trinity, Robert Morey, pp. 73ff
The Trinitarian begins with the a priori assumption that the triune God of Father, Son and Holy Spirit will be incomprehensible because God is incomprehensible in His nature. (This means that God cannot be fully understood; not that he cannot be partially understood. We can only understand God partially.)
Any god we could fully understand and explain would be less than what we are. He who can understand God would be greater than God.
The incomprehensibility of God is, thus, not a surprise to the Trinitarian. If there is an infinite God who has revealed Himself to finite man, then it only follows that what is revealed will go beyond man's finite capacity to understand.
If we begin with the a priori assumption that, if something cannot be fully explained, it must be rejected, then we must reject the love and peace of Christ because they are "beyond our comprehension" Eph 3:19; Php 4:7.
Job 5:8-9; 11:7-9; 36:26; 42:1-4,6; Psa 77:19; 92:5; 139:6; 145:3; Ecc 3:11; 8:17; 11:5; Isa 40:28; Rom 11:33-34; Eph
3:8,19; Php 4:7