Doubts never end. If one doubt is removed, another takes its place. It is like removing the leaves of a tree one by one. Even if all the leaves are clipped off, new ones grow. The tree itself must be uprooted.
Without understanding yourself, what is the use of trying to understand the world?
The body dies, but the spirit that transcends it cannot be touched by death.
Time and space always change, but there is something which is eternal and changeless. For example, the world and time, past or future, nothing exists for us in sleep. But we exist. Let us try to find out that which is changeless and which always exists.
No one succeeds without effort... Those who succeed owe their success to perseverance.
Our own self-realization is the greatest service we can render the world.