Any concept of biology is not only sterile and profitless, it is distorted and untrue, if it puts its primary focus on unnatural conditions rather than on those vast forces not of man's making that shape and channel the nature and direction of life.
The unpleasant events you are passing from will not have been profitless to you.
Knowledge without labor is profitless. Knowledge with labor is genius.
I know what I want and what I might gain, and yet, how profitless to know.
The most profitless things to manufacture are excuses.
When the mind forgets the purpose of Christian life, then even the clear fulfillment of virtue becomes profitless.
But this is a true saying among men: the gifts of enemies are no gifts and profitless.