Man gropes about as though walking in darkness. His way is beset on all sides with problems that press in upon him and clamour for a solution. To these problems man can often turn but an uncomprehending glance, for he has no knowledge to apply to their solution. Professing to know and also to be wise, nevertheless he does not know, and hence his decisions and judgments are not those of wisdom and knowledge. With God, however, knowledge is to be found, as well as the ability to apply this knowledge. God is all-knowing and God is all-wise. To be able to address such a God is a blessing indeed.
~ E. J. Young, on Psalm 139 v.2