I have quite a few, mainly maritime related, so I will skip them and go with ones that are more 'spiritually' related:
From Eckhart Tolle:
“Sometimes letting things go is an act of far greater power than defending or hanging on.”
“Give up defining yourself - to yourself or to others. You won't die. You will come to life. And don't be concerned with how others define you. When they define you, they are limiting themselves, so it's their problem. Whenever you interact with people, don't be there primarily as a function or a role, but as the field of conscious Presence. You can only lose something that you have, but you cannot lose something that you are.”
“You find peace not by rearranging the circumstances of your life, but by realizing who you are at the deepest level.”
“Death is a stripping away of all that is not you. The secret of life is to "die before you die" --- and find that there is no death.”
“Time isn’t precious at all, because it is an illusion. What you perceive as precious is not time but the one point that is out of time: the Now. That is precious indeed. The more you are focused on time—past and future—the more you miss the Now, the most precious thing there is.”
“Always say “yes” to the present moment. What could be more futile, more insane, than to create inner resistance to what already is? what could be more insane than to oppose life itself, which is now and always now? Surrender to what is. Say “yes” to life — and see how life suddenly starts working for you rather than against you.”
“If you get the inside right, the outside will fall into place. Primary reality is within; secondary reality without.”
“Any action is often better than no action, especially if you have been stuck in an unhappy situation for a long time. If it is a mistake, at least you learn something, in which case it's no longer a mistake. If you remain stuck, you learn nothing.”
“Knowing yourself is to be rooted in Being, instead of lost in your mind.”
“Once you have had a glimpse of awareness or Presence, you know it firsthand. It is no longer just a concept in your mind.”
“The greatest achievement of humanity is not its works of art, science, or technology, but the recognition of its own dysfunction.”
“Only the truth of who you are, if realized, will set you free.”
From Eugene O'Neill:
“It was a great mistake, my being born a man, I would have been much more successful as a seagull or a fish. As it is, I will always be a stranger who never feels at home, who does not really want and is not really wanted, who can never belong, who must be a little in love with death!”
From William Butler Yeats:
A sea captain when he stands upon the bridge, or looks out from his deck-house, thinks much about God and about the world. Away in the valley yonder among the corn and the poppies men may well forget all things except the warmth of the sun upon the face, and the kind shadow under the hedge; but he who journeys through storm and darkness must needs think and think. One July a couple of years ago I took my supper with a Captain Moran on board the s.s. Margaret, that had put into a western river from I know not where. I found him a man of many notions all flavoured with his personality, as is the way with sailors. He talked in his queer sea manner of God and the world, and up through all his words broke the hard energy of his calling.
From Kptlt. Kaden:
"In the eyes of the sea and of death, everything that is false, petty, ungenuine and untrue passes away; all empty phrases, all ringing words are extinguished; every human vanity, every human covetousness sinks away. In the face of the sea and of death only the simple, the unpretentious and the true is of value - and ultimately only the deed!"
From Alan Villiers:
"At sea, like that, you see the utmost 'innards' of a man - what he is made of. No subterfuges, no pretense of city life, no masking of real intents and real character, will pass here; you see all."
From Steve Jobs:
Almost everything--all external expectations, all pride, all fear of embarrassment or failure--these things just fall away in the face of death, leaving only what is truly important. Remembering that you are going to die is the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no reason not to follow your heart.
Here's to the crazy ones, the misfits, the rebels, the troublemakers, the round pegs in the square holes... the ones who see things differently -- they're not fond of rules... You can quote them, disagree with them, glorify or vilify them, but the only thing you can't do is ignore them because they change things... they push the human race forward, and while some may see them as the crazy ones, we see genius, because the ones who are crazy enough to think that they can change the world, are the ones who do.