People can be unreliable and disloyal; possessions can lose their value; jobs that once stimulated you can become boring. But principles remain steady through it all.
Nido Qubein

Beware of all enterprises that require new clothes.
Henry David Thoreau

It is extremely unlikely that anyone coming out of school with a technical degree will go into one area and stay there. Today's students have to look forward to the excitement of probably having three or four careers.
Gordon Moore