When weight loss becomes a goal in your life, eating right and exercising are just two pieces of the puzzle. Figuring out why you've put on the extra weight is the hardest part.
Silence is one of the hardest arguments to refute.
The hardest thing in the world to understand is the income tax.
To endure oneself may be the hardest task in the universe. You cannot hire a wise man or any other intellect to solve it for you. There's no writ of inquest or calling of witness to provide answers. No servant or disciple can dress the wound. You dress it yourself or continue bleeding for all to see.
The hardest thing about the road not taken is that you never know where it might have led.
Teaching was the hardest work I had ever done, and it remains the hardest work I have done to date.
The books that help you most are those which make you think that most. The hardest way of learning is that of easy reading; but a great book that comes from a great thinker is a ship of thought, deep freighted with truth and beauty.
And many strokes, though with a little axe, Hew down and fell the hardest-timbered oak.
Nature is not cruel, pitiless, indifferent. This is one of the hardest lessons for humans to learn. We cannot admit that things might be neither good nor evil, neither cruel nor kind, but simply callous -- indifferent to all suffering, lacking all purpose.