Building a castle is difficult. Defending and maintaining it is harder still.

Don't waste your life in doubts and fears: Spend yourself on the work before you, well assured that the right performance of this hour's duties will be the best preparation for the hours or ages that follow it.

Don’t take too much advice. Most people who have a lot of advice to give — with a few exceptions — generalize whatever they did. Don’t over-analyze everything. I myself have been guilty of over-thinking problems. Just build things and find out if they work.

To do great things is difficult; but to command great things is more difficult.

One of the huge mistakes people make is that they try to force an interest on themselves. You don’t choose your passions; your passions choose you.

Leaders don’t force people to follow, they invite them on a journey.

Do not wait to strike until the iron is hot; but make it hot by striking.