All good things can be achieved only with effort.
Bad things are easy to do; good things are done with work and effort.
— Dhammapada: a book of Buddhist Wisdom
Enter by the narrow gate; for the gate is wide, and the way is broad that leads to destruction, and many are those who enter by it. For the gate is small, and the way is narrow that leads to life, and few are those who find it.
— Matthew 7:13-14
The way to true knowledge does not go through soft grass covered with flowers. To find it, a person must climb steep mountains.
— John Ruskin
Look for the truth; it wants to be found.
— Blaise Pascal
A person cries out from pain when he takes up hard physical work after a period of idleness. Any rest from the struggle for spiritual improvement brings the same pain.