All you need in this life is ignorance and confidence; then success is sure. You can "already know for sure" things that could actually impede progress. Always be on the lookout for the things you did not know, that you did not know. Secondly, work on strengthening personal belief that a particular will be achieved regardless of any adversity that may show up, or evidence to the contrary.
If the desire to kill and the opportunity to kill always came together, who would escape hanging? Framed in a more positive light, this tells us also that if we wish to accomplish a particular thing then we need to increase our level of desire for that thing and to create or seek out the opportunities and right environment for it to happen without fail.
A man cannot be comfortable without his own approval. There is nothing more satisfying than that sense of being completely "at home" in your own skin. When you achieve that as a natural state of "being", then you can finally look beyond yourself and fully contribute all your talents to the world.
Sometime, somewhere you take something to be the truth. But if you cling to it too strongly, then even when the truth comes in person and knocks on your door, you will not open it.
He had an uncommon fondness for cats. As an old man summering in New Hampshire, Twain even rented kittens from a nearby farm to keep him company until he returned home. "If man could be crossed with the cat," said Twain, "it would improve the man, but it would deteriorate the cat." There's always something about your success that displeases even your best friends.