Every generation of Christians must face the dilemma of how to live in the tension between the possibility of Christ's immediate return and the impossibility of predicting the moment. Many Christians unfortunately settle the problem by living as if Christ will not return. Meanwhile, others dabble in various fruitless but persistent schemes to "figure out" the time of Christ's return.
 
But as for you, brethren, do not grow weary in doing good. (2 Thessalonians 3:13)

If the hope of His arrival stirs up a wholehearted commitment to do good for His sake, then we will be ready for Him. (From NKJV commentary)