Great works are performed not by strength but by perseverance.

To love one that is great, is almost to be great one's self.

Self-confidence is the first requisite to great undertakings.

Few enterprises of great labor or hazard would be undertaken if we had not the power of magnifying the advantages we expect from them.

Leisure and curiosity might soon make great advances in useful knowledge, were they not diverted by minute emulation and laborious trifles.