If you are depressed, you are living in the past.
If you are anxious, you are living in the future.
If you are at peace, you are living in the present. –Unknown

Learn to think fearlessly. There is no subject too spiritual, no subject that cannot stand the analysis of mind; spirit depends upon the channel, mind, for reality, and what is more real than logic? - –Alfred J. Parker

There exists, if I am not mistaken, an entire world which is the totality of mathematical truths, to which we have access only with our mind, just as a world of physical reality exists, the one like the other independent of ourselves, both of divine creation. –Charles Hermite

Every situation, properly perceived, becomes an opportunity. –Helen Schucman