Nothing is easy to the unwilling.

Some suggestions for you :

An invincible determination can accomplish almost anything and in this lies the great distinction between great men and little men.

A gift, with a kind countenance, is a double present.

Scalded cats fear even cold water.

Abused patience turns to fury.

A little skill in antiquity inclines a man to Popery.

The grave is the general meeting place.

Poor men's reasons are not heard.

A book that is shut is but a block.

Absence sharpens love, presence strengthens it.

If it were not for hope, the heart would break.

Pride will spit in pride's face.

Seeing is believing, but the feeling is the truth.

A good garden may have some weeds.

He is poor indeed that can promise nothing.