Happiness is peace of mind. Riches do not necessarily bring happiness. Pursue such a course in life as will bring pleasant memories, for upon that depends a successful life, both spiritual and mental. You will see quite a bit of the tragedies of life. Smile and laugh all you can.
Engineering is common sense first, and mathematics next.
Engineering is nothing but getting the most out of a dollar and turning out quality products at the same time. A man who can't shut his eyes and see through the cast iron walls of a cylinder and watch the piston moving up and down isn't fit to study engineering. Don't go blindly about the world, but try to find out the reason for things. Knowledge comes from reflection. Learning comes from books.