We must remember that knowledge of one’s own deep nature is also simultaneously knowledge of human nature in general.

He that is good with a hammer tends to think everything is a nail.

The spiritual life is part of the human essence. It is a defining characteristic of human nature, without which human nature is not fully human.

Human nature has been sold short...[humans have] a higher nature which...includes the need for meaningful work, for responsibility, for creativeness, for being fair and just, for doing what is worthwhile and for preferring to do it well.

Self-actualizing people must be what they can be.

In order for us to become truly happy, that which we can become, we must become.

If the essential core of the person is denied or suppressed, he gets sick sometimes in obvious ways, sometimes in subtle ways, sometimes immediately, sometimes later.