Aids to Concentration - Attention without Tension
BEFORE you sit down to commence the practice of recall quietly but definitely decide what is to be your object of concentration and for how long you propose to sustain it. Sometimes people sit down and then begin to decide what to do; they start on one object and then change to another because they find it unsatisfactory, and at last they wake up to realize that their time has gone and they have done nothing. Read more »
concentration, meditations, odd times, posture, time has gone 
