No work or love will flourish out of guilt, fear, or hollowness of heart, just as no valid plans for the future can be made by those who have no capacity for living now.
We are what we think, and all that we are rises with our thoughts. With our thoughts we make the world. Speak and act with a pure mind and happiness will follow.
Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.