An hour a day passed in such scientific or literary pursuits will furnish as many facts as the memory can retain, and will give him 'a pleasure not to be repented of' (Timaeus).

Only let him beware of being the slave of crotchets, or of running after a Will o' the Wisp in his ignorance, or in his vanity of attributing to himself the gifts of a poet or assuming the air of a philosopher.

He should know the limits of his own powers.

Better to build up the mind by slow additions, to creep on quietly from one thing to another, to gain insensibly new powers and new interests in knowledge, than to form vast schemes which are never destined to be realized.

But perhaps, as Plato would say, 'This is part of another subject' (Tim.); though we may also defend our digression by his example (Theaet.).
4.