Ignorance more frequently begets confidence than does knowledge.  
有志之士珍惜每一年的光阴;贤德之人,珍惜每一天的光阴;而圣人则会珍惜每一寸的光阴。
死者总是与我们同在,我们也总是与他们同在。
Confidence comes from preparation and knowing your stuff.