It's important to make an ...

It's important to make an effort under any circumstance - stagnant, sickness, being in an unstable lifestyle, even when society is insane. You should consider such periods as an omen before you move. When you are stuck on something, it is important to hold to your purpose but not press onward against the current. When you can't move at all, try to concentrate, continuing forward as if in a boat switching to a stronger motor. The keiko that is most important when you cannot move is kage no keiko [shadow training].
 Masaaki Hatsumi

Quotes from the same author

Nature is your friend; it helps you to win. Your enemy will have unnatural movement, therefore you will be able to know what he is going to do before he does it.
 Masaaki Hatsumi
When weak or injured always continue training as you should always be able to adapt in any condition.
 Masaaki Hatsumi
Always be able to kill your students
 Masaaki Hatsumi
What I want you to do is just take it as it is. Don't think too much. If you get involved with thinking about it, the whole thing gets lost or loses its purity. Don't think during practice - DO! The more you think, the further from the truth of budo you get: Budo is NOT an academic subject!
 Masaaki Hatsumi
Forget your sadness, anger, grudges, and hatred. Let them pass like smoke caught in the breeze. You should not deviate from the path of righteousness; you should lead a life worthy of a man. Don't be possessed by greed, luxury, or your ego. You should accept sorrows, sadness and hatred as they are, and consider them a chance for trial given to you by the powers... a blessing given by nature. Have both your mind and your time fully engaged in bud?, and have your mind deeply set on bujutsu.
 Masaaki Hatsumi