The most all penetrating spirit before which will open the possibility of tilting not tables, but planets, is the spirit of free human inquiry. Believe only in that. ↗
But in the life of every man there are influences of a far more real and penetrating character than those which come through the medium of schools or teachers. ↗
The physiologist who succeeds in penetrating deeper and deeper into the digestive canal becomes convinced that it consists of a number of chemical laboratories equipped with various mechanical devices. ↗
Perhaps it's the people whose lives have taken sudden new twists - people who have learned to embrace the creative possibilities of change - who stand the best chance of penetrating life's mysteries. ↗
In the present epoch of struggle between two worlds the two opposing and antagonistic trends penetrating the foundations of nearly all branches of biology are particularly sharply defined. ↗